diff --git a/cmd/tailscale/cli/serve_v2.go b/cmd/tailscale/cli/serve_v2.go
index c359fce1f..2f1c4eda8 100644
--- a/cmd/tailscale/cli/serve_v2.go
+++ b/cmd/tailscale/cli/serve_v2.go
@@ -440,10 +440,9 @@ const backgroundExistsMsg = "background configuration already exists, use `tails
 // validateConfig checks if the serve config is valid to serve the type wanted on the port.
 // dnsName is a FQDN or a serviceName (with `svc:` prefix).
 func (e *serveEnv) validateConfig(sc *ipn.ServeConfig, port uint16, wantServe serveType, dnsName string) error {
-	forService := ipn.IsServiceName(dnsName)
 	var tcpHandlerForPort *ipn.TCPPortHandler
-	if forService {
-		svc := sc.Services[tailcfg.ServiceName(dnsName)]
+	if svcName, ok := tailcfg.AsServiceName(dnsName); ok {
+		svc := sc.Services[svcName]
 		if svc == nil {
 			return nil
 		}
@@ -521,7 +520,7 @@ func (e *serveEnv) setServe(sc *ipn.ServeConfig, st *ipnstate.Status, dnsName st
 
 	// update the serve config based on if funnel is enabled
 	// Since funnel is not supported for services, we only apply it for node's serve.
-	if !ipn.IsServiceName(dnsName) {
+	if _, ok := tailcfg.AsServiceName(dnsName); !ok {
 		e.applyFunnel(sc, dnsName, srvPort, allowFunnel)
 	}
 	return nil
@@ -544,14 +543,14 @@ var (
 // serve config and status.
 func (e *serveEnv) messageForPort(sc *ipn.ServeConfig, st *ipnstate.Status, dnsName string, srvType serveType, srvPort uint16) string {
 	var output strings.Builder
-	forService := ipn.IsServiceName(dnsName)
+	svcName, forService := tailcfg.AsServiceName(dnsName)
 	var hp ipn.HostPort
 	var webConfig *ipn.WebServerConfig
 	var tcpHandler *ipn.TCPPortHandler
 	ips := st.TailscaleIPs
 	host := dnsName
 	if forService {
-		host = tailcfg.ServiceName(dnsName).WithoutPrefix() + "." + st.CurrentTailnet.MagicDNSSuffix
+		host = strings.Join([]string{svcName.WithoutPrefix(), st.CurrentTailnet.MagicDNSSuffix}, ".")
 	}
 	hp = ipn.HostPort(net.JoinHostPort(host, strconv.Itoa(int(srvPort))))
 
@@ -578,7 +577,6 @@ func (e *serveEnv) messageForPort(sc *ipn.ServeConfig, st *ipnstate.Status, dnsN
 		return "", ""
 	}
 	if forService {
-		svcName := tailcfg.ServiceName(dnsName)
 		serviceIPMaps, err := tailcfg.UnmarshalNodeCapJSON[tailcfg.ServiceIPMappings](st.Self.CapMap, tailcfg.NodeAttrServiceHost)
 		if err != nil || len(serviceIPMaps) == 0 || serviceIPMaps[0][svcName] == nil {
 			// The capmap does not contain IPs for this service yet. Usually this means
@@ -924,12 +922,12 @@ func (e *serveEnv) removeWebServe(sc *ipn.ServeConfig, st *ipnstate.Status, dnsN
 	if sc == nil {
 		return nil
 	}
-	forService := ipn.IsServiceName(dnsName)
+
 	portStr := strconv.Itoa(int(srvPort))
 	hostName := dnsName
 	webServeMap := sc.Web
+	svcName, forService := tailcfg.AsServiceName(dnsName)
 	if forService {
-		svcName := tailcfg.ServiceName(dnsName)
 		svc := sc.Services[svcName]
 		if svc == nil {
 			return errors.New("service does not exist")
diff --git a/ipn/serve.go b/ipn/serve.go
index 595463a37..5f42dd8e1 100644
--- a/ipn/serve.go
+++ b/ipn/serve.go
@@ -177,8 +177,8 @@ func (sc *ServeConfig) GetWebHandler(dnsName string, hp HostPort, mount string)
 	if sc == nil {
 		return nil
 	}
-	if IsServiceName(dnsName) {
-		if svc, ok := sc.Services[tailcfg.ServiceName(dnsName)]; ok && svc.Web != nil {
+	if svcName, ok := tailcfg.AsServiceName(dnsName); ok {
+		if svc, ok := sc.Services[svcName]; ok && svc.Web != nil {
 			if webCfg, ok := svc.Web[hp]; ok {
 				return webCfg.Handlers[mount]
 			}
@@ -197,8 +197,8 @@ func (sc *ServeConfig) GetTCPPortHandler(port uint16, dnsName string) *TCPPortHa
 	if sc == nil {
 		return nil
 	}
-	if IsServiceName(dnsName) {
-		if svc, ok := sc.Services[tailcfg.ServiceName(dnsName)]; ok && svc != nil {
+	if svcName, ok := tailcfg.AsServiceName(dnsName); ok {
+		if svc, ok := sc.Services[svcName]; ok && svc != nil {
 			return svc.TCP[port]
 		}
 		return nil
@@ -244,18 +244,6 @@ func (sc *ServeConfig) IsTCPForwardingAny() bool {
 	return false
 }
 
-// IsServiceName reports whether if the given string is a valid service name.
-func IsServiceName(s string) bool {
-	return tailcfg.ServiceName(s).Validate() == nil
-}
-
-// asServiceName reports whether if the given string is a valid service name,
-// and if so returns the name as a [tailcfg.ServiceName].
-func asServiceName(s string) (svcName tailcfg.ServiceName, ok bool) {
-	svcName = tailcfg.ServiceName(s)
-	return svcName, svcName.Validate() == nil
-}
-
 // IsTCPForwardingOnPort reports whether ServeConfig is currently forwarding
 // in TCPForward mode on the given port for a DNSName. DNSName will be either node's DNSName, or a
 // serviceName for service hosted on node. This is exclusive of Web/HTTPS serving.
@@ -263,9 +251,9 @@ func (sc *ServeConfig) IsTCPForwardingOnPort(port uint16, dnsName string) bool {
 	if sc == nil {
 		return false
 	}
-	forService := IsServiceName(dnsName)
-	if forService {
-		svc, ok := sc.Services[tailcfg.ServiceName(dnsName)]
+
+	if svcName, ok := tailcfg.AsServiceName(dnsName); ok {
+		svc, ok := sc.Services[svcName]
 		if !ok || svc == nil {
 			return false
 		}
@@ -293,7 +281,7 @@ func (sc *ServeConfig) IsServingHTTPS(port uint16, dnsName string) bool {
 		return false
 	}
 	var tcpHandlers map[uint16]*TCPPortHandler
-	if svcName, ok := asServiceName(dnsName); ok {
+	if svcName, ok := tailcfg.AsServiceName(dnsName); ok {
 		if svc := sc.Services[svcName]; svc != nil {
 			tcpHandlers = svc.TCP
 		}
@@ -315,8 +303,8 @@ func (sc *ServeConfig) IsServingHTTP(port uint16, dnsName string) bool {
 	if sc == nil {
 		return false
 	}
-	if IsServiceName(dnsName) {
-		if svc, ok := sc.Services[tailcfg.ServiceName(dnsName)]; ok && svc != nil {
+	if svcName, ok := tailcfg.AsServiceName(dnsName); ok {
+		if svc, ok := sc.Services[svcName]; ok && svc != nil {
 			if svc.TCP[port] != nil {
 				return svc.TCP[port].HTTP
 			}
@@ -359,8 +347,7 @@ func (sc *ServeConfig) SetWebHandler(st *ipnstate.Status, handler *HTTPHandler,
 	tcpMap := &sc.TCP
 	webServerMap := &sc.Web
 	hostName := host
-	if IsServiceName(host) {
-		svcName := tailcfg.ServiceName(host)
+	if svcName, ok := tailcfg.AsServiceName(host); ok {
 		hostName = svcName.WithoutPrefix() + "." + st.CurrentTailnet.MagicDNSSuffix
 		if _, ok := sc.Services[svcName]; !ok {
 			mak.Set(&sc.Services, svcName, new(ServiceConfig))
@@ -403,8 +390,7 @@ func (sc *ServeConfig) SetTCPForwarding(port uint16, fwdAddr string, terminateTL
 		sc = new(ServeConfig)
 	}
 	tcpPortHandler := &sc.TCP
-	if IsServiceName(host) {
-		svcName := tailcfg.ServiceName(host)
+	if svcName, ok := tailcfg.AsServiceName(host); ok {
 		svcConfig, ok := sc.Services[svcName]
 		if !ok {
 			svcConfig = new(ServiceConfig)
@@ -499,8 +485,8 @@ func (sc *ServeConfig) RemoveServiceWebHandler(st *ipnstate.Status, svcName tail
 // RemoveTCPForwarding deletes the TCP forwarding configuration for the given
 // port from the serve config.
 func (sc *ServeConfig) RemoveTCPForwarding(dnsName string, port uint16) {
-	if IsServiceName(dnsName) {
-		if svc, ok := sc.Services[tailcfg.ServiceName(dnsName)]; ok && svc != nil {
+	if svcName, ok := tailcfg.AsServiceName(dnsName); ok {
+		if svc := sc.Services[svcName]; svc != nil {
 			delete(svc.TCP, port)
 			if len(svc.TCP) == 0 {
 				svc.TCP = nil
diff --git a/tailcfg/tailcfg.go b/tailcfg/tailcfg.go
index 3c262960a..9b952f20d 100644
--- a/tailcfg/tailcfg.go
+++ b/tailcfg/tailcfg.go
@@ -915,6 +915,13 @@ type TPMInfo struct {
 // This is not related to the older [Service] used in [Hostinfo.Services].
 type ServiceName string
 
+// AsServiceName reports whether if the given string is a valid service name,
+// and if so returns the name as a [tailcfg.ServiceName].
+func AsServiceName(s string) (svcName ServiceName, ok bool) {
+	svcName = ServiceName(s)
+	return svcName, svcName.Validate() == nil
+}
+
 // Validate validates if the service name is formatted correctly.
 // We only allow valid DNS labels, since the expectation is that these will be
 // used as parts of domain names. All errors are [vizerror.Error].