diff --git a/docs/docs/apis/proto/instance.md b/docs/docs/apis/proto/instance.md
index a20b1f0802..43152e5cea 100644
--- a/docs/docs/apis/proto/instance.md
+++ b/docs/docs/apis/proto/instance.md
@@ -91,6 +91,23 @@ IdQuery is always equals
 | details |  zitadel.v1.ObjectDetails | - |  |
 | state |  State | - |  |
 | name |  string | - |  |
+| version |  string | - |  |
+
+
+
+
+### InstanceDetail
+
+
+
+| Field | Type | Description | Validation |
+| ----- | ---- | ----------- | ----------- |
+| id |  string | - |  |
+| details |  zitadel.v1.ObjectDetails | - |  |
+| state |  State | - |  |
+| name |  string | - |  |
+| version |  string | - |  |
+| domains | repeated Domain | - |  |
 
 
 
diff --git a/docs/docs/apis/proto/system.md b/docs/docs/apis/proto/system.md
index caf4c73ecc..83207df658 100644
--- a/docs/docs/apis/proto/system.md
+++ b/docs/docs/apis/proto/system.md
@@ -25,7 +25,7 @@ It respondes as soon as ZITADEL started
 > **rpc** ListInstances([ListInstancesRequest](#listinstancesrequest))
 [ListInstancesResponse](#listinstancesresponse)
 
-Returns a list of ZITADEL instances/tenants
+Returns a list of ZITADEL instances
 
 
 
@@ -41,7 +41,7 @@ Returns the detail of an instance
 
 
 
-    GET: /instances/{id}
+    GET: /instances/{instance_id}
 
 
 ### AddInstance
@@ -67,7 +67,19 @@ This might take some time
 
 
 
-    DELETE: /instances/{id}
+    DELETE: /instances/{instance_id}
+
+
+### ExistsDomain
+
+> **rpc** ExistsDomain([ExistsDomainRequest](#existsdomainrequest))
+[ExistsDomainResponse](#existsdomainresponse)
+
+Checks if a domain exists
+
+
+
+    POST: /domains/{domain}/_exists
 
 
 ### ListDomains
@@ -79,7 +91,7 @@ Returns the custom domains of an instance
 
 
 
-    POST: /instances/{id}/domains/_search
+    POST: /instances/{instance_id}/domains/_search
 
 
 ### AddDomain
@@ -91,7 +103,7 @@ Returns the domain of an instance
 
 
 
-    POST: /instances/{id}/domains
+    POST: /instances/{instance_id}/domains
 
 
 ### RemoveDomain
@@ -103,7 +115,7 @@ Returns the domain of an instance
 
 
 
-    DELETE: /instances/{id}/domains/{domain}
+    DELETE: /instances/{instance_id}/domains/{domain}
 
 
 ### SetPrimaryDomain
@@ -115,7 +127,7 @@ Returns the domain of an instance
 
 
 
-    POST: /instances/{id}/domains/_set_primary
+    POST: /instances/{instance_id}/domains/_set_primary
 
 
 ### ListViews
@@ -191,7 +203,7 @@ failed event. You can find out if it worked on the `failure_count`
 
 | Field | Type | Description | Validation |
 | ----- | ---- | ----------- | ----------- |
-| id |  string | - | string.min_len: 1<br /> string.max_len: 200<br />  |
+| instance_id |  string | - | string.min_len: 1<br /> string.max_len: 200<br />  |
 | domain |  string | - | string.min_len: 1<br /> string.max_len: 200<br />  |
 
 
@@ -217,12 +229,47 @@ failed event. You can find out if it worked on the `failure_count`
 | instance_name |  string | - | string.min_len: 1<br /> string.max_len: 200<br />  |
 | first_org_name |  string | - | string.max_len: 200<br />  |
 | custom_domain |  string | - | string.max_len: 200<br />  |
-| owner_first_name |  string | - | string.max_len: 200<br />  |
-| owner_last_name |  string | - | string.max_len: 200<br />  |
-| owner_email |  string | - | string.min_len: 1<br /> string.max_len: 200<br />  |
-| owner_username |  string | - | string.max_len: 200<br />  |
-| request_limit |  uint64 | - |  |
-| action_mins_limit |  uint64 | - |  |
+| owner_user_name |  string | - | string.max_len: 200<br />  |
+| owner_email |  AddInstanceRequest.Email | - | message.required: true<br />  |
+| owner_profile |  AddInstanceRequest.Profile | - | message.required: false<br />  |
+| owner_password |  AddInstanceRequest.Password | - | message.required: false<br />  |
+
+
+
+
+### AddInstanceRequest.Email
+
+
+
+| Field | Type | Description | Validation |
+| ----- | ---- | ----------- | ----------- |
+| email |  string | - | string.min_len: 1<br /> string.max_len: 200<br />  |
+| is_email_verified |  bool | - |  |
+
+
+
+
+### AddInstanceRequest.Password
+
+
+
+| Field | Type | Description | Validation |
+| ----- | ---- | ----------- | ----------- |
+| password |  string | - | string.max_len: 200<br />  |
+| password_change_required |  bool | - |  |
+
+
+
+
+### AddInstanceRequest.Profile
+
+
+
+| Field | Type | Description | Validation |
+| ----- | ---- | ----------- | ----------- |
+| first_name |  string | - | string.max_len: 200<br />  |
+| last_name |  string | - | string.max_len: 200<br />  |
+| preferred_language |  string | - | string.max_len: 10<br />  |
 
 
 
@@ -233,7 +280,7 @@ failed event. You can find out if it worked on the `failure_count`
 
 | Field | Type | Description | Validation |
 | ----- | ---- | ----------- | ----------- |
-| id |  string | - |  |
+| instance_id |  string | - |  |
 | details |  zitadel.v1.ObjectDetails | - |  |
 
 
@@ -282,6 +329,28 @@ This is an empty response
 
 
 
+### ExistsDomainRequest
+
+
+
+| Field | Type | Description | Validation |
+| ----- | ---- | ----------- | ----------- |
+| domain |  string | - | string.min_len: 1<br /> string.max_len: 200<br />  |
+
+
+
+
+### ExistsDomainResponse
+
+
+
+| Field | Type | Description | Validation |
+| ----- | ---- | ----------- | ----------- |
+| exists |  bool | - |  |
+
+
+
+
 ### FailedEvent
 
 
@@ -303,7 +372,7 @@ This is an empty response
 
 | Field | Type | Description | Validation |
 | ----- | ---- | ----------- | ----------- |
-| id |  string | - | string.min_len: 1<br /> string.max_len: 200<br />  |
+| instance_id |  string | - | string.min_len: 1<br /> string.max_len: 200<br />  |
 
 
 
@@ -314,7 +383,7 @@ This is an empty response
 
 | Field | Type | Description | Validation |
 | ----- | ---- | ----------- | ----------- |
-| instance |  zitadel.instance.v1.Instance | - |  |
+| instance |  zitadel.instance.v1.InstanceDetail | - |  |
 
 
 
@@ -325,7 +394,7 @@ This is an empty response
 
 | Field | Type | Description | Validation |
 | ----- | ---- | ----------- | ----------- |
-| id |  string | - | string.min_len: 1<br /> string.max_len: 200<br />  |
+| instance_id |  string | - | string.min_len: 1<br /> string.max_len: 200<br />  |
 
 
 
@@ -361,7 +430,7 @@ This is an empty response
 
 | Field | Type | Description | Validation |
 | ----- | ---- | ----------- | ----------- |
-| id |  string | list limitations and ordering | string.min_len: 1<br /> string.max_len: 200<br />  |
+| instance_id |  string | list limitations and ordering | string.min_len: 1<br /> string.max_len: 200<br />  |
 | query |  zitadel.v1.ListQuery | - |  |
 | sorting_column |  zitadel.instance.v1.DomainFieldName | the field the result is sorted |  |
 | queries | repeated zitadel.instance.v1.DomainSearchQuery | criterias the client is looking for |  |
@@ -448,7 +517,7 @@ This is an empty request
 
 | Field | Type | Description | Validation |
 | ----- | ---- | ----------- | ----------- |
-| id |  string | - | string.min_len: 1<br /> string.max_len: 200<br />  |
+| instance_id |  string | - | string.min_len: 1<br /> string.max_len: 200<br />  |
 | domain |  string | - | string.min_len: 1<br /> string.max_len: 200<br />  |
 
 
@@ -490,7 +559,7 @@ This is an empty response
 
 | Field | Type | Description | Validation |
 | ----- | ---- | ----------- | ----------- |
-| id |  string | - | string.min_len: 1<br /> string.max_len: 200<br />  |
+| instance_id |  string | - | string.min_len: 1<br /> string.max_len: 200<br />  |
 
 
 
@@ -512,7 +581,7 @@ This is an empty response
 
 | Field | Type | Description | Validation |
 | ----- | ---- | ----------- | ----------- |
-| id |  string | - | string.min_len: 1<br /> string.max_len: 200<br />  |
+| instance_id |  string | - | string.min_len: 1<br /> string.max_len: 200<br />  |
 | domain |  string | - | string.min_len: 1<br /> string.max_len: 200<br />  |
 
 
diff --git a/internal/api/grpc/instance/converter.go b/internal/api/grpc/instance/converter.go
index d8283416e2..bb410316aa 100644
--- a/internal/api/grpc/instance/converter.go
+++ b/internal/api/grpc/instance/converter.go
@@ -23,7 +23,22 @@ func InstanceToPb(instance *query.Instance) *instance_pb.Instance {
 			instance.ChangeDate,
 			instance.InstanceID(),
 		),
-		Id: instance.InstanceID(),
+		Id:   instance.InstanceID(),
+		Name: instance.Name,
+	}
+}
+
+func InstanceDetailToPb(instance *query.Instance) *instance_pb.InstanceDetail {
+	return &instance_pb.InstanceDetail{
+		Details: object.ToViewDetailsPb(
+			instance.Sequence,
+			instance.CreationDate,
+			instance.ChangeDate,
+			instance.InstanceID(),
+		),
+		Id:      instance.InstanceID(),
+		Name:    instance.Name,
+		Domains: DomainsToPb(instance.Domains),
 	}
 }
 
diff --git a/internal/api/grpc/management/user_converter.go b/internal/api/grpc/management/user_converter.go
index 11202db217..77f1d7c09b 100644
--- a/internal/api/grpc/management/user_converter.go
+++ b/internal/api/grpc/management/user_converter.go
@@ -5,6 +5,7 @@ import (
 	"time"
 
 	"github.com/zitadel/logging"
+	"github.com/zitadel/zitadel/pkg/grpc/user"
 	"golang.org/x/text/language"
 
 	"github.com/zitadel/zitadel/internal/api/authz"
@@ -27,14 +28,38 @@ func ListUsersRequestToModel(req *mgmt_pb.ListUsersRequest) (*query.UserSearchQu
 	}
 	return &query.UserSearchQueries{
 		SearchRequest: query.SearchRequest{
-			Offset: offset,
-			Limit:  limit,
-			Asc:    asc,
+			Offset:        offset,
+			Limit:         limit,
+			Asc:           asc,
+			SortingColumn: UserFieldNameToSortingColumn(req.SortingColumn),
 		},
 		Queries: queries,
 	}, nil
 }
 
+func UserFieldNameToSortingColumn(field user.UserFieldName) query.Column {
+	switch field {
+	case user.UserFieldName_USER_FIELD_NAME_EMAIL:
+		return query.HumanEmailCol
+	case user.UserFieldName_USER_FIELD_NAME_FIRST_NAME:
+		return query.HumanFirstNameCol
+	case user.UserFieldName_USER_FIELD_NAME_LAST_NAME:
+		return query.HumanLastNameCol
+	case user.UserFieldName_USER_FIELD_NAME_DISPLAY_NAME:
+		return query.HumanDisplayNameCol
+	case user.UserFieldName_USER_FIELD_NAME_USER_NAME:
+		return query.UserUsernameCol
+	case user.UserFieldName_USER_FIELD_NAME_STATE:
+		return query.UserStateCol
+	case user.UserFieldName_USER_FIELD_NAME_TYPE:
+		return query.UserTypeCol
+	case user.UserFieldName_USER_FIELD_NAME_NICK_NAME:
+		return query.HumanNickNameCol
+	default:
+		return query.UserIDCol
+	}
+}
+
 func BulkSetMetadataToDomain(req *mgmt_pb.BulkSetUserMetadataRequest) []*domain.Metadata {
 	metadata := make([]*domain.Metadata, len(req.Metadata))
 	for i, data := range req.Metadata {
diff --git a/internal/api/grpc/system/instance.go b/internal/api/grpc/system/instance.go
index 3650392192..2fe8187524 100644
--- a/internal/api/grpc/system/instance.go
+++ b/internal/api/grpc/system/instance.go
@@ -6,6 +6,7 @@ import (
 	"github.com/zitadel/zitadel/internal/api/authz"
 	instance_grpc "github.com/zitadel/zitadel/internal/api/grpc/instance"
 	"github.com/zitadel/zitadel/internal/api/grpc/object"
+	"github.com/zitadel/zitadel/internal/query"
 	object_pb "github.com/zitadel/zitadel/pkg/grpc/object"
 	system_pb "github.com/zitadel/zitadel/pkg/grpc/system"
 )
@@ -29,13 +30,13 @@ func (s *Server) ListInstances(ctx context.Context, req *system_pb.ListInstances
 }
 
 func (s *Server) GetInstance(ctx context.Context, req *system_pb.GetInstanceRequest) (*system_pb.GetInstanceResponse, error) {
-	ctx = authz.WithInstanceID(ctx, req.Id)
+	ctx = authz.WithInstanceID(ctx, req.InstanceId)
 	instance, err := s.query.Instance(ctx)
 	if err != nil {
 		return nil, err
 	}
 	return &system_pb.GetInstanceResponse{
-		Instance: instance_grpc.InstanceToPb(instance),
+		Instance: instance_grpc.InstanceDetailToPb(instance),
 	}, nil
 }
 
@@ -45,7 +46,7 @@ func (s *Server) AddInstance(ctx context.Context, req *system_pb.AddInstanceRequ
 		return nil, err
 	}
 	return &system_pb.AddInstanceResponse{
-		Id: id,
+		InstanceId: id,
 		Details: object.AddToDetailsPb(
 			details.Sequence,
 			details.EventDate,
@@ -55,8 +56,30 @@ func (s *Server) AddInstance(ctx context.Context, req *system_pb.AddInstanceRequ
 	return nil, nil
 }
 
+func (s *Server) ExistsDomain(ctx context.Context, req *system_pb.ExistsDomainRequest) (*system_pb.ExistsDomainResponse, error) {
+	domainQuery, err := query.NewInstanceDomainDomainSearchQuery(query.TextEqualsIgnoreCase, req.Domain)
+
+	query := &query.InstanceDomainSearchQueries{
+		SearchRequest: query.SearchRequest{
+			Offset: 0,
+			Limit:  1,
+			Asc:    true,
+		},
+		Queries: []query.SearchQuery{
+			domainQuery,
+		},
+	}
+	domains, err := s.query.SearchInstanceDomains(ctx, query)
+	if err != nil {
+		return nil, err
+	}
+	return &system_pb.ExistsDomainResponse{
+		Exists: domains.Count > 0,
+	}, nil
+}
+
 func (s *Server) ListDomains(ctx context.Context, req *system_pb.ListDomainsRequest) (*system_pb.ListDomainsResponse, error) {
-	ctx = authz.WithInstanceID(ctx, req.Id)
+	ctx = authz.WithInstanceID(ctx, req.InstanceId)
 	queries, err := ListInstanceDomainsRequestToModel(req)
 	if err != nil {
 		return nil, err
@@ -77,7 +100,7 @@ func (s *Server) ListDomains(ctx context.Context, req *system_pb.ListDomainsRequ
 }
 
 func (s *Server) AddDomain(ctx context.Context, req *system_pb.AddDomainRequest) (*system_pb.AddDomainResponse, error) {
-	ctx = authz.WithInstanceID(ctx, req.Id)
+	ctx = authz.WithInstanceID(ctx, req.InstanceId)
 	instance, err := s.query.Instance(ctx)
 	if err != nil {
 		return nil, err
@@ -97,7 +120,7 @@ func (s *Server) AddDomain(ctx context.Context, req *system_pb.AddDomainRequest)
 }
 
 func (s *Server) RemoveDomain(ctx context.Context, req *system_pb.RemoveDomainRequest) (*system_pb.RemoveDomainResponse, error) {
-	ctx = authz.WithInstanceID(ctx, req.Id)
+	ctx = authz.WithInstanceID(ctx, req.InstanceId)
 	details, err := s.command.RemoveInstanceDomain(ctx, req.Domain)
 	if err != nil {
 		return nil, err
@@ -112,7 +135,7 @@ func (s *Server) RemoveDomain(ctx context.Context, req *system_pb.RemoveDomainRe
 }
 
 func (s *Server) SetPrimaryDomain(ctx context.Context, req *system_pb.SetPrimaryDomainRequest) (*system_pb.SetPrimaryDomainResponse, error) {
-	ctx = authz.WithInstanceID(ctx, req.Id)
+	ctx = authz.WithInstanceID(ctx, req.InstanceId)
 	details, err := s.command.SetPrimaryInstanceDomain(ctx, req.Domain)
 	if err != nil {
 		return nil, err
diff --git a/internal/api/grpc/system/instance_converter.go b/internal/api/grpc/system/instance_converter.go
index 761e5cd3fe..35ef672b2c 100644
--- a/internal/api/grpc/system/instance_converter.go
+++ b/internal/api/grpc/system/instance_converter.go
@@ -7,6 +7,7 @@ import (
 	"github.com/zitadel/zitadel/internal/query"
 	instance_pb "github.com/zitadel/zitadel/pkg/grpc/instance"
 	system_pb "github.com/zitadel/zitadel/pkg/grpc/system"
+	"golang.org/x/text/language"
 )
 
 func AddInstancePbToSetupInstance(req *system_pb.AddInstanceRequest, defaultInstance command.InstanceSetup) *command.InstanceSetup {
@@ -20,18 +21,32 @@ func AddInstancePbToSetupInstance(req *system_pb.AddInstanceRequest, defaultInst
 	if req.FirstOrgName != "" {
 		defaultInstance.Org.Name = req.FirstOrgName
 	}
-	if req.OwnerEmail != "" {
-		defaultInstance.Org.Human.Email.Address = req.OwnerEmail
+	if req.OwnerEmail.Email != "" {
+		defaultInstance.Org.Human.Email.Address = req.OwnerEmail.Email
+		defaultInstance.Org.Human.Email.Verified = req.OwnerEmail.IsEmailVerified
 	}
-	if req.OwnerUsername != "" {
-		defaultInstance.Org.Human.Username = req.OwnerUsername
+	if req.OwnerProfile != nil {
+		if req.OwnerProfile.FirstName != "" {
+			defaultInstance.Org.Human.FirstName = req.OwnerProfile.FirstName
+		}
+		if req.OwnerProfile.LastName != "" {
+			defaultInstance.Org.Human.LastName = req.OwnerProfile.LastName
+		}
+		if req.OwnerProfile.PreferredLanguage != "" {
+			lang, err := language.Parse(req.OwnerProfile.PreferredLanguage)
+			if err == nil {
+				defaultInstance.Org.Human.PreferredLang = lang
+			}
+		}
 	}
-	if req.OwnerFirstName != "" {
-		defaultInstance.Org.Human.FirstName = req.OwnerFirstName
+	if req.OwnerUserName != "" {
+		defaultInstance.Org.Human.Username = req.OwnerUserName
 	}
-	if req.OwnerLastName != "" {
-		defaultInstance.Org.Human.LastName = req.OwnerLastName
+	if req.OwnerPassword != nil {
+		defaultInstance.Org.Human.Password = req.OwnerPassword.Password
+		defaultInstance.Org.Human.PasswordChangeRequired = req.OwnerPassword.PasswordChangeRequired
 	}
+
 	return &defaultInstance
 }
 func ListInstancesRequestToModel(req *system_pb.ListInstancesRequest) (*query.InstanceSearchQueries, error) {
diff --git a/internal/query/instance.go b/internal/query/instance.go
index e4f5a83f7d..dbb032101b 100644
--- a/internal/query/instance.go
+++ b/internal/query/instance.go
@@ -75,6 +75,7 @@ type Instance struct {
 	ChangeDate   time.Time
 	CreationDate time.Time
 	Sequence     uint64
+	Name         string
 
 	GlobalOrgID  string
 	IAMProjectID string
@@ -83,6 +84,7 @@ type Instance struct {
 	DefaultLang  language.Tag
 	SetupStarted domain.Step
 	SetupDone    domain.Step
+	Domains      []*InstanceDomain
 	host         string
 }
 
@@ -159,7 +161,7 @@ func (q *Queries) SearchInstances(ctx context.Context, queries *InstanceSearchQu
 }
 
 func (q *Queries) Instance(ctx context.Context) (*Instance, error) {
-	stmt, scan := prepareInstanceQuery(authz.GetInstance(ctx).RequestedDomain())
+	stmt, scan := prepareInstanceDomainQuery(authz.GetInstance(ctx).RequestedDomain())
 	query, args, err := stmt.Where(sq.Eq{
 		InstanceColumnID.identifier(): authz.GetInstance(ctx).InstanceID(),
 	}).ToSql()
@@ -167,7 +169,10 @@ func (q *Queries) Instance(ctx context.Context) (*Instance, error) {
 		return nil, errors.ThrowInternal(err, "QUERY-d9ngs", "Errors.Query.SQLStatement")
 	}
 
-	row := q.client.QueryRowContext(ctx, query, args...)
+	row, err := q.client.QueryContext(ctx, query, args...)
+	if err != nil {
+		return nil, err
+	}
 	return scan(row)
 }
 
@@ -181,7 +186,10 @@ func (q *Queries) InstanceByHost(ctx context.Context, host string) (authz.Instan
 		return nil, errors.ThrowInternal(err, "QUERY-SAfg2", "Errors.Query.SQLStatement")
 	}
 
-	row := q.client.QueryRowContext(ctx, query, args...)
+	row, err := q.client.QueryContext(ctx, query, args...)
+	if err != nil {
+		return nil, err
+	}
 	return scan(row)
 }
 
@@ -226,9 +234,9 @@ func prepareInstanceQuery(host string) (sq.SelectBuilder, func(*sql.Row) (*Insta
 			)
 			if err != nil {
 				if errs.Is(err, sql.ErrNoRows) {
-					return nil, errors.ThrowNotFound(err, "QUERY-n0wng", "Errors.IAM.NotFound")
+					return nil, errors.ThrowNotFound(err, "QUERY-5m09s", "Errors.IAM.NotFound")
 				}
-				return nil, errors.ThrowInternal(err, "QUERY-d9nw", "Errors.Internal")
+				return nil, errors.ThrowInternal(err, "QUERY-3j9sf", "Errors.Internal")
 			}
 			instance.DefaultLang = language.Make(lang)
 			return instance, nil
@@ -241,6 +249,7 @@ func prepareInstancesQuery() (sq.SelectBuilder, func(*sql.Rows) (*Instances, err
 			InstanceColumnCreationDate.identifier(),
 			InstanceColumnChangeDate.identifier(),
 			InstanceColumnSequence.identifier(),
+			InstanceColumnName.identifier(),
 			InstanceColumnGlobalOrgID.identifier(),
 			InstanceColumnProjectID.identifier(),
 			InstanceColumnConsoleID.identifier(),
@@ -262,6 +271,7 @@ func prepareInstancesQuery() (sq.SelectBuilder, func(*sql.Rows) (*Instances, err
 					&instance.CreationDate,
 					&instance.ChangeDate,
 					&instance.Sequence,
+					&instance.Name,
 					&instance.GlobalOrgID,
 					&instance.IAMProjectID,
 					&instance.ConsoleID,
@@ -290,12 +300,13 @@ func prepareInstancesQuery() (sq.SelectBuilder, func(*sql.Rows) (*Instances, err
 		}
 }
 
-func prepareInstanceDomainQuery(host string) (sq.SelectBuilder, func(*sql.Row) (*Instance, error)) {
+func prepareInstanceDomainQuery(host string) (sq.SelectBuilder, func(*sql.Rows) (*Instance, error)) {
 	return sq.Select(
 			InstanceColumnID.identifier(),
 			InstanceColumnCreationDate.identifier(),
 			InstanceColumnChangeDate.identifier(),
 			InstanceColumnSequence.identifier(),
+			InstanceColumnName.identifier(),
 			InstanceColumnGlobalOrgID.identifier(),
 			InstanceColumnProjectID.identifier(),
 			InstanceColumnConsoleID.identifier(),
@@ -303,33 +314,73 @@ func prepareInstanceDomainQuery(host string) (sq.SelectBuilder, func(*sql.Row) (
 			InstanceColumnSetupStarted.identifier(),
 			InstanceColumnSetupDone.identifier(),
 			InstanceColumnDefaultLanguage.identifier(),
+			InstanceDomainDomainCol.identifier(),
+			InstanceDomainIsPrimaryCol.identifier(),
+			InstanceDomainIsGeneratedCol.identifier(),
+			InstanceDomainCreationDateCol.identifier(),
+			InstanceDomainChangeDateCol.identifier(),
+			InstanceDomainSequenceCol.identifier(),
 		).
 			From(instanceTable.identifier()).
 			LeftJoin(join(InstanceDomainInstanceIDCol, InstanceColumnID)).
 			PlaceholderFormat(sq.Dollar),
-		func(row *sql.Row) (*Instance, error) {
-			instance := &Instance{host: host}
-			lang := ""
-			err := row.Scan(
-				&instance.ID,
-				&instance.CreationDate,
-				&instance.ChangeDate,
-				&instance.Sequence,
-				&instance.GlobalOrgID,
-				&instance.IAMProjectID,
-				&instance.ConsoleID,
-				&instance.ConsoleAppID,
-				&instance.SetupStarted,
-				&instance.SetupDone,
-				&lang,
-			)
-			if err != nil {
-				if errs.Is(err, sql.ErrNoRows) {
-					return nil, errors.ThrowNotFound(err, "QUERY-n0wng", "Errors.IAM.NotFound")
-				}
-				return nil, errors.ThrowInternal(err, "QUERY-d9nw", "Errors.Internal")
+		func(rows *sql.Rows) (*Instance, error) {
+			instance := &Instance{
+				host:    host,
+				Domains: make([]*InstanceDomain, 0),
+			}
+			lang := ""
+			for rows.Next() {
+				var (
+					domain       sql.NullString
+					isPrimary    sql.NullBool
+					isGenerated  sql.NullBool
+					changeDate   sql.NullTime
+					creationDate sql.NullTime
+					sequecne     sql.NullInt64
+				)
+				err := rows.Scan(
+					&instance.ID,
+					&instance.CreationDate,
+					&instance.ChangeDate,
+					&instance.Sequence,
+					&instance.Name,
+					&instance.GlobalOrgID,
+					&instance.IAMProjectID,
+					&instance.ConsoleID,
+					&instance.ConsoleAppID,
+					&instance.SetupStarted,
+					&instance.SetupDone,
+					&lang,
+					&domain,
+					&isPrimary,
+					&isGenerated,
+					&changeDate,
+					&creationDate,
+					&sequecne,
+				)
+				if err != nil {
+					if errs.Is(err, sql.ErrNoRows) {
+						return nil, errors.ThrowNotFound(err, "QUERY-n0wng", "Errors.IAM.NotFound")
+					}
+					return nil, errors.ThrowInternal(err, "QUERY-d9nw", "Errors.Internal")
+				}
+				if !domain.Valid {
+					continue
+				}
+				instance.Domains = append(instance.Domains, &InstanceDomain{
+					CreationDate: creationDate.Time,
+					ChangeDate:   changeDate.Time,
+					Sequence:     uint64(sequecne.Int64),
+					Domain:       domain.String,
+					IsPrimary:    isPrimary.Bool,
+					IsGenerated:  isGenerated.Bool,
+					InstanceID:   instance.ID,
+				})
+			}
+			if err := rows.Close(); err != nil {
+				return nil, errors.ThrowInternal(err, "QUERY-Dfbe2", "Errors.Query.CloseRows")
 			}
-			instance.DefaultLang = language.Make(lang)
 			return instance, nil
 		}
 }
diff --git a/internal/query/search_query.go b/internal/query/search_query.go
index 169e2c8211..2f71a906ce 100644
--- a/internal/query/search_query.go
+++ b/internal/query/search_query.go
@@ -31,18 +31,16 @@ func (req *SearchRequest) toQuery(query sq.SelectBuilder) sq.SelectBuilder {
 	}
 
 	if !req.SortingColumn.isZero() {
-		clause := "LOWER(" + sqlPlaceholder + ")"
+		clause := req.SortingColumn.orderBy()
 		if !req.Asc {
 			clause += " DESC"
 		}
-		query = query.OrderByClause(clause, req.SortingColumn.identifier())
+		query = query.OrderByClause(clause)
 	}
 
 	return query
 }
 
-const sqlPlaceholder = "?"
-
 type SearchQuery interface {
 	toQuery(sq.SelectBuilder) sq.SelectBuilder
 	comp() sq.Sqlizer
@@ -367,8 +365,9 @@ func (t table) isZero() bool {
 }
 
 type Column struct {
-	name  string
-	table table
+	name           string
+	table          table
+	isOrderByLower bool
 }
 
 func (c Column) identifier() string {
@@ -381,6 +380,13 @@ func (c Column) identifier() string {
 	return c.name
 }
 
+func (c Column) orderBy() string {
+	if !c.isOrderByLower {
+		return c.identifier()
+	}
+	return "LOWER(" + c.identifier() + ")"
+}
+
 func (c Column) setTable(t table) Column {
 	c.table = t
 	return c
diff --git a/internal/query/search_query_test.go b/internal/query/search_query_test.go
index 7af1c3af77..47ae03c9cf 100644
--- a/internal/query/search_query_test.go
+++ b/internal/query/search_query_test.go
@@ -19,6 +19,11 @@ var (
 		name:  "test_col",
 		table: testTable,
 	}
+	testLowerCol = Column{
+		name:           "test_lower_col",
+		table:          testTable,
+		isOrderByLower: true,
+	}
 	testNoCol = Column{
 		name:  "",
 		table: testTable,
@@ -34,7 +39,6 @@ func TestSearchRequest_ToQuery(t *testing.T) {
 	}
 	type want struct {
 		stmtAddition string
-		args         []interface{}
 	}
 	tests := []struct {
 		name   string
@@ -46,7 +50,6 @@ func TestSearchRequest_ToQuery(t *testing.T) {
 			fields: fields{},
 			want: want{
 				stmtAddition: "",
-				args:         nil,
 			},
 		},
 		{
@@ -56,7 +59,6 @@ func TestSearchRequest_ToQuery(t *testing.T) {
 			},
 			want: want{
 				stmtAddition: "OFFSET 5",
-				args:         nil,
 			},
 		},
 		{
@@ -66,7 +68,6 @@ func TestSearchRequest_ToQuery(t *testing.T) {
 			},
 			want: want{
 				stmtAddition: "LIMIT 5",
-				args:         nil,
 			},
 		},
 		{
@@ -76,8 +77,7 @@ func TestSearchRequest_ToQuery(t *testing.T) {
 				Asc:           true,
 			},
 			want: want{
-				stmtAddition: "ORDER BY LOWER(?)",
-				args:         []interface{}{"test_table.test_col"},
+				stmtAddition: "ORDER BY test_table.test_col",
 			},
 		},
 		{
@@ -86,8 +86,17 @@ func TestSearchRequest_ToQuery(t *testing.T) {
 				SortingColumn: testCol,
 			},
 			want: want{
-				stmtAddition: "ORDER BY LOWER(?) DESC",
-				args:         []interface{}{"test_table.test_col"},
+				stmtAddition: "ORDER BY test_table.test_col DESC",
+			},
+		},
+		{
+			name: "sort lower asc",
+			fields: fields{
+				SortingColumn: testLowerCol,
+				Asc:           true,
+			},
+			want: want{
+				stmtAddition: "ORDER BY LOWER(test_table.test_lower_col)",
 			},
 		},
 		{
@@ -99,8 +108,7 @@ func TestSearchRequest_ToQuery(t *testing.T) {
 				Asc:           true,
 			},
 			want: want{
-				stmtAddition: "ORDER BY LOWER(?) LIMIT 10 OFFSET 5",
-				args:         []interface{}{"test_table.test_col"},
+				stmtAddition: "ORDER BY test_table.test_col LIMIT 10 OFFSET 5",
 			},
 		},
 	}
@@ -116,7 +124,7 @@ func TestSearchRequest_ToQuery(t *testing.T) {
 			query := sq.Select((testCol).identifier()).From(testTable.identifier())
 			expectedQuery, _, _ := query.ToSql()
 
-			stmt, args, err := req.toQuery(query).ToSql()
+			stmt, _, err := req.toQuery(query).ToSql()
 			if len(tt.want.stmtAddition) > 0 {
 				expectedQuery += " " + tt.want.stmtAddition
 			}
@@ -124,10 +132,6 @@ func TestSearchRequest_ToQuery(t *testing.T) {
 				t.Errorf("stmt = %q, want %q", stmt, expectedQuery)
 			}
 
-			if !reflect.DeepEqual(args, tt.want.args) {
-				t.Errorf("args = %v, want %v", args, tt.want.stmtAddition)
-			}
-
 			if err != nil {
 				t.Errorf("no error expected but got %v", err)
 			}
diff --git a/internal/query/user.go b/internal/query/user.go
index 9ae41aa740..65f9a29bb3 100644
--- a/internal/query/user.go
+++ b/internal/query/user.go
@@ -130,8 +130,9 @@ var (
 		table: userTable,
 	}
 	UserUsernameCol = Column{
-		name:  projection.UserUsernameCol,
-		table: userTable,
+		name:           projection.UserUsernameCol,
+		table:          userTable,
+		isOrderByLower: true,
 	}
 	UserTypeCol = Column{
 		name:  projection.UserTypeCol,
@@ -163,20 +164,24 @@ var (
 		table: humanTable,
 	}
 	HumanFirstNameCol = Column{
-		name:  projection.HumanFirstNameCol,
-		table: humanTable,
+		name:           projection.HumanFirstNameCol,
+		table:          humanTable,
+		isOrderByLower: true,
 	}
 	HumanLastNameCol = Column{
-		name:  projection.HumanLastNameCol,
-		table: humanTable,
+		name:           projection.HumanLastNameCol,
+		table:          humanTable,
+		isOrderByLower: true,
 	}
 	HumanNickNameCol = Column{
-		name:  projection.HumanNickNameCol,
-		table: humanTable,
+		name:           projection.HumanNickNameCol,
+		table:          humanTable,
+		isOrderByLower: true,
 	}
 	HumanDisplayNameCol = Column{
-		name:  projection.HumanDisplayNameCol,
-		table: humanTable,
+		name:           projection.HumanDisplayNameCol,
+		table:          humanTable,
+		isOrderByLower: true,
 	}
 	HumanPreferredLanguageCol = Column{
 		name:  projection.HumanPreferredLanguageCol,
@@ -193,8 +198,9 @@ var (
 
 	// email
 	HumanEmailCol = Column{
-		name:  projection.HumanEmailCol,
-		table: humanTable,
+		name:           projection.HumanEmailCol,
+		table:          humanTable,
+		isOrderByLower: true,
 	}
 	HumanIsEmailVerifiedCol = Column{
 		name:  projection.HumanIsEmailVerifiedCol,
@@ -221,8 +227,9 @@ var (
 		table: machineTable,
 	}
 	MachineNameCol = Column{
-		name:  projection.MachineNameCol,
-		table: machineTable,
+		name:           projection.MachineNameCol,
+		table:          machineTable,
+		isOrderByLower: true,
 	}
 	MachineDescriptionCol = Column{
 		name:  projection.MachineDescriptionCol,
@@ -397,27 +404,27 @@ func NewUserResourceOwnerSearchQuery(value string, comparison TextComparison) (S
 }
 
 func NewUserUsernameSearchQuery(value string, comparison TextComparison) (SearchQuery, error) {
-	return NewTextQuery(UserUsernameCol, value, comparison)
+	return NewTextQuery(Column(UserUsernameCol), value, comparison)
 }
 
 func NewUserFirstNameSearchQuery(value string, comparison TextComparison) (SearchQuery, error) {
-	return NewTextQuery(HumanFirstNameCol, value, comparison)
+	return NewTextQuery(Column(HumanFirstNameCol), value, comparison)
 }
 
 func NewUserLastNameSearchQuery(value string, comparison TextComparison) (SearchQuery, error) {
-	return NewTextQuery(HumanLastNameCol, value, comparison)
+	return NewTextQuery(Column(HumanLastNameCol), value, comparison)
 }
 
 func NewUserNickNameSearchQuery(value string, comparison TextComparison) (SearchQuery, error) {
-	return NewTextQuery(HumanNickNameCol, value, comparison)
+	return NewTextQuery(Column(HumanNickNameCol), value, comparison)
 }
 
 func NewUserDisplayNameSearchQuery(value string, comparison TextComparison) (SearchQuery, error) {
-	return NewTextQuery(HumanDisplayNameCol, value, comparison)
+	return NewTextQuery(Column(HumanDisplayNameCol), value, comparison)
 }
 
 func NewUserEmailSearchQuery(value string, comparison TextComparison) (SearchQuery, error) {
-	return NewTextQuery(HumanEmailCol, value, comparison)
+	return NewTextQuery(Column(HumanEmailCol), value, comparison)
 }
 
 func NewUserStateSearchQuery(value int32) (SearchQuery, error) {
diff --git a/proto/zitadel/instance.proto b/proto/zitadel/instance.proto
index e27c0c84b2..e75dd89bf6 100644
--- a/proto/zitadel/instance.proto
+++ b/proto/zitadel/instance.proto
@@ -25,6 +25,36 @@ message Instance {
             example: "\"ZITADEL\"";
         }
     ];
+    string version = 5 [
+        (grpc.gateway.protoc_gen_openapiv2.options.openapiv2_field) = {
+            example: "\"1.0.0\"";
+        }
+    ];
+}
+
+message InstanceDetail {
+    string id = 1 [
+        (grpc.gateway.protoc_gen_openapiv2.options.openapiv2_field) = {
+            example: "\"69629023906488334\""
+        }
+    ];
+    zitadel.v1.ObjectDetails details = 2;
+    State state = 3 [
+        (grpc.gateway.protoc_gen_openapiv2.options.openapiv2_field) = {
+            description: "current state of the instance";
+        }
+    ];
+    string name = 4 [
+        (grpc.gateway.protoc_gen_openapiv2.options.openapiv2_field) = {
+            example: "\"ZITADEL\"";
+        }
+    ];
+    string version = 5 [
+        (grpc.gateway.protoc_gen_openapiv2.options.openapiv2_field) = {
+            example: "\"1.0.0\"";
+        }
+    ];
+    repeated Domain domains = 6;
 }
 
 enum State {
diff --git a/proto/zitadel/system.proto b/proto/zitadel/system.proto
index 229d81e8d0..baeefec7e4 100644
--- a/proto/zitadel/system.proto
+++ b/proto/zitadel/system.proto
@@ -102,7 +102,7 @@ service SystemService {
         };
     }
 
-    // Returns a list of ZITADEL instances/tenants
+    // Returns a list of ZITADEL instances
     rpc ListInstances(ListInstancesRequest) returns (ListInstancesResponse) {
         option (google.api.http) = {
             post: "/instances/_search"
@@ -113,7 +113,7 @@ service SystemService {
     // Returns the detail of an instance
     rpc GetInstance(GetInstanceRequest) returns (GetInstanceResponse) {
         option (google.api.http) = {
-            get: "/instances/{id}";
+            get: "/instances/{instance_id}";
         };
     }
 
@@ -130,14 +130,22 @@ service SystemService {
     // This might take some time
     rpc RemoveInstance(RemoveInstanceRequest) returns (RemoveInstanceResponse) {
         option (google.api.http) = {
-            delete: "/instances/{id}"
+            delete: "/instances/{instance_id}"
+        };
+    }
+
+    // Checks if a domain exists
+    rpc ExistsDomain(ExistsDomainRequest) returns (ExistsDomainResponse) {
+        option (google.api.http) = {
+            post: "/domains/{domain}/_exists";
+            body: "*"
         };
     }
 
     // Returns the custom domains of an instance
     rpc ListDomains(ListDomainsRequest) returns (ListDomainsResponse) {
         option (google.api.http) = {
-            post: "/instances/{id}/domains/_search";
+            post: "/instances/{instance_id}/domains/_search";
             body: "*"
         };
     }
@@ -145,7 +153,7 @@ service SystemService {
     // Returns the domain of an instance
     rpc AddDomain(AddDomainRequest) returns (AddDomainResponse) {
         option (google.api.http) = {
-            post: "/instances/{id}/domains";
+            post: "/instances/{instance_id}/domains";
             body: "*"
         };
     }
@@ -153,14 +161,14 @@ service SystemService {
     // Returns the domain of an instance
     rpc RemoveDomain(RemoveDomainRequest) returns (RemoveDomainResponse) {
         option (google.api.http) = {
-            delete: "/instances/{id}/domains/{domain}";
+            delete: "/instances/{instance_id}/domains/{domain}";
         };
     }
 
     // Returns the domain of an instance
     rpc SetPrimaryDomain(SetPrimaryDomainRequest) returns (SetPrimaryDomainResponse) {
         option (google.api.http) = {
-            post: "/instances/{id}/domains/_set_primary";
+            post: "/instances/{instance_id}/domains/_set_primary";
             body: "*"
         };
     }
@@ -309,32 +317,44 @@ message ListInstancesResponse {
 }
 
 message GetInstanceRequest {
-    string id = 1 [(validate.rules).string = {min_len: 1, max_len: 200}];
+    string instance_id = 1 [(validate.rules).string = {min_len: 1, max_len: 200}];
 }
 
 message GetInstanceResponse {
-    zitadel.instance.v1.Instance instance = 1;
+    zitadel.instance.v1.InstanceDetail instance = 1;
 }
 
 message AddInstanceRequest {
+    message Profile {
+        string first_name = 1 [(validate.rules).string = {max_len: 200}];
+        string last_name = 2 [(validate.rules).string = {max_len: 200}];
+        string preferred_language = 5 [(validate.rules).string = {max_len: 10}];
+    }
+    message Email {
+        string email = 1[(validate.rules).string = {min_len: 1, max_len: 200}];
+        bool is_email_verified = 2;
+    }
+    message Password {
+        string password = 1 [(validate.rules).string = {max_len: 200}];
+        bool password_change_required = 2;
+    }
+
     string instance_name = 1 [(validate.rules).string = {min_len: 1, max_len: 200}];
     string first_org_name = 2 [(validate.rules).string = {max_len: 200}];
     string custom_domain = 3 [(validate.rules).string = {max_len: 200}];
-    string owner_first_name = 4 [(validate.rules).string = {max_len: 200}];
-    string owner_last_name = 5 [(validate.rules).string = {max_len: 200}];
-    string owner_email = 6 [(validate.rules).string = {min_len: 1, max_len: 200}];
-    string owner_username = 7 [(validate.rules).string = {max_len: 200}];
-    uint64 request_limit = 8;
-    uint64 action_mins_limit = 9;
+    string owner_user_name = 4 [(validate.rules).string = {max_len: 200}];
+    Email owner_email = 5 [(validate.rules).message.required = true];
+    Profile owner_profile = 6 [(validate.rules).message.required = false];
+    Password owner_password = 7 [(validate.rules).message.required = false];
 }
 
 message AddInstanceResponse {
-    string id = 1;
+    string instance_id = 1;
     zitadel.v1.ObjectDetails details = 2;
 }
 
 message RemoveInstanceRequest {
-    string id = 1 [(validate.rules).string = {min_len: 1, max_len: 200}];
+    string instance_id = 1 [(validate.rules).string = {min_len: 1, max_len: 200}];
 }
 
 message RemoveInstanceResponse {
@@ -342,7 +362,7 @@ message RemoveInstanceResponse {
 }
 
 message GetUsageRequest {
-    string id = 1 [(validate.rules).string = {min_len: 1, max_len: 200}];
+    string instance_id = 1 [(validate.rules).string = {min_len: 1, max_len: 200}];
 }
 
 message GetUsageResponse {
@@ -351,8 +371,16 @@ message GetUsageResponse {
     uint64 executed_action_mins = 3;
 }
 
+message ExistsDomainRequest {
+    string domain = 1 [(validate.rules).string = {min_len: 1, max_len: 200}];
+}
+
+message ExistsDomainResponse {
+    bool exists = 1;
+}
+
 message ListDomainsRequest {
-    string id = 1 [(validate.rules).string = {min_len: 1, max_len: 200}];//list limitations and ordering
+    string instance_id = 1 [(validate.rules).string = {min_len: 1, max_len: 200}];//list limitations and ordering
     zitadel.v1.ListQuery query = 2;
     // the field the result is sorted
     zitadel.instance.v1.DomainFieldName sorting_column = 3;
@@ -367,7 +395,7 @@ message ListDomainsResponse {
 }
 
 message AddDomainRequest {
-    string id = 1 [(validate.rules).string = {min_len: 1, max_len: 200}];
+    string instance_id = 1 [(validate.rules).string = {min_len: 1, max_len: 200}];
     string domain = 2 [(validate.rules).string = {min_len: 1, max_len: 200}];
 }
 
@@ -376,7 +404,7 @@ message AddDomainResponse {
 }
 
 message RemoveDomainRequest {
-    string id = 1 [(validate.rules).string = {min_len: 1, max_len: 200}];
+    string instance_id = 1 [(validate.rules).string = {min_len: 1, max_len: 200}];
     string domain = 2 [(validate.rules).string = {min_len: 1, max_len: 200}];
 }
 
@@ -385,7 +413,7 @@ message RemoveDomainResponse {
 }
 
 message SetPrimaryDomainRequest {
-    string id = 1 [(validate.rules).string = {min_len: 1, max_len: 200}];
+    string instance_id = 1 [(validate.rules).string = {min_len: 1, max_len: 200}];
     string domain = 2 [(validate.rules).string = {min_len: 1, max_len: 200}];
 }