diff --git a/spinifex/admin/admin_test.go b/spinifex/admin/admin_test.go
index e43668417..14c99fc51 100644
--- a/spinifex/admin/admin_test.go
+++ b/spinifex/admin/admin_test.go
@@ -621,7 +621,7 @@ func TestGenerateCertificatesIfNeeded(t *testing.T) {
 	dir := t.TempDir()
 
 	// First call generates all certs
-	caCertPath := GenerateCertificatesIfNeeded(dir, false, "", "us-east-1", "mulga.internal")
+	caCertPath := GenerateCertificatesIfNeeded(dir, false, "", "us-east-1", "spinifex.internal")
 	assert.Equal(t, filepath.Join(dir, "ca.pem"), caCertPath)
 	assert.True(t, FileExists(filepath.Join(dir, "ca.pem")))
 	assert.True(t, FileExists(filepath.Join(dir, "ca.key")))
@@ -632,7 +632,7 @@ func TestGenerateCertificatesIfNeeded(t *testing.T) {
 		caInfo, _ := os.Stat(filepath.Join(dir, "ca.pem"))
 		origModTime := caInfo.ModTime()
 
-		GenerateCertificatesIfNeeded(dir, false, "", "us-east-1", "mulga.internal")
+		GenerateCertificatesIfNeeded(dir, false, "", "us-east-1", "spinifex.internal")
 		caInfo2, _ := os.Stat(filepath.Join(dir, "ca.pem"))
 		assert.Equal(t, origModTime, caInfo2.ModTime())
 	})
@@ -640,7 +640,7 @@ func TestGenerateCertificatesIfNeeded(t *testing.T) {
 	t.Run("ForceRegenerates", func(t *testing.T) {
 		origCA, _ := os.ReadFile(filepath.Join(dir, "ca.pem"))
 
-		GenerateCertificatesIfNeeded(dir, true, "", "us-east-1", "mulga.internal")
+		GenerateCertificatesIfNeeded(dir, true, "", "us-east-1", "spinifex.internal")
 		newCA, _ := os.ReadFile(filepath.Join(dir, "ca.pem"))
 		assert.NotEqual(t, origCA, newCA)
 	})
@@ -660,7 +660,7 @@ func TestGenerateServerCertOnly(t *testing.T) {
 		require.NoError(t, os.WriteFile(filepath.Join(dir, "ca.pem"), caCert, 0600))
 		require.NoError(t, os.WriteFile(filepath.Join(dir, "ca.key"), caKey, 0600))
 
-		err := GenerateServerCertOnly(dir, "10.0.0.5", "us-east-1", "mulga.internal")
+		err := GenerateServerCertOnly(dir, "10.0.0.5", "us-east-1", "spinifex.internal")
 		require.NoError(t, err)
 		assert.True(t, FileExists(filepath.Join(dir, "server.pem")))
 		assert.True(t, FileExists(filepath.Join(dir, "server.key")))
@@ -678,13 +678,13 @@ func TestGenerateServerCertOnly(t *testing.T) {
 		assert.True(t, hasBindIP)
 
 		// AWS-parity ECR SANs must be present.
-		assert.Contains(t, cert.DNSNames, "ecr.us-east-1.mulga.internal")
-		assert.Contains(t, cert.DNSNames, "*.dkr.ecr.us-east-1.mulga.internal")
+		assert.Contains(t, cert.DNSNames, "ecr.us-east-1.spinifex.internal")
+		assert.Contains(t, cert.DNSNames, "*.dkr.ecr.us-east-1.spinifex.internal")
 	})
 
 	t.Run("MissingCA", func(t *testing.T) {
 		dir := t.TempDir()
-		err := GenerateServerCertOnly(dir, "10.0.0.5", "us-east-1", "mulga.internal")
+		err := GenerateServerCertOnly(dir, "10.0.0.5", "us-east-1", "spinifex.internal")
 		assert.Error(t, err)
 		assert.Contains(t, err.Error(), "CA files not found")
 	})
@@ -693,13 +693,13 @@ func TestGenerateServerCertOnly(t *testing.T) {
 func TestAWSGWServiceDNSNames(t *testing.T) {
 	t.Parallel()
 
-	got := AWSGWServiceDNSNames("us-east-1", "mulga.internal")
+	got := AWSGWServiceDNSNames("us-east-1", "spinifex.internal")
 	assert.Equal(t, []string{
-		"ecr.us-east-1.mulga.internal",
-		"*.dkr.ecr.us-east-1.mulga.internal",
+		"ecr.us-east-1.spinifex.internal",
+		"*.dkr.ecr.us-east-1.spinifex.internal",
 	}, got)
 
-	assert.Nil(t, AWSGWServiceDNSNames("", "mulga.internal"))
+	assert.Nil(t, AWSGWServiceDNSNames("", "spinifex.internal"))
 	assert.Nil(t, AWSGWServiceDNSNames("us-east-1", ""))
 	assert.Nil(t, AWSGWServiceDNSNames("", ""))
 }
diff --git a/spinifex/awserrors/awserrors.go b/spinifex/awserrors/awserrors.go
index fd635ad49..b3144b040 100644
--- a/spinifex/awserrors/awserrors.go
+++ b/spinifex/awserrors/awserrors.go
@@ -466,6 +466,7 @@ var (
 	ErrorLayersNotFound           = "LayersNotFoundException"
 	ErrorReferencedImagesNotFound = "ReferencedImagesNotFoundException"
 	ErrorTooManyTags              = "TooManyTagsException"
+	ErrorOperationNotSupported    = "OperationNotSupportedException"
 
 	// ELBv2-specific error codes
 	ErrorELBv2LoadBalancerNotFound         = "LoadBalancerNotFound"
@@ -984,6 +985,7 @@ var ErrorLookup = map[string]ErrorMessage{
 	ErrorLayersNotFound:           {HTTPCode: 400, Message: "The specified layers could not be found, or the specified layer is not valid for this repository."},
 	ErrorReferencedImagesNotFound: {HTTPCode: 400, Message: "The manifest list is referencing an image that does not exist."},
 	ErrorTooManyTags:              {HTTPCode: 400, Message: "The list of tags on the repository is over the limit. The maximum number of tags that can be applied to a repository is 50."},
+	ErrorOperationNotSupported:    {HTTPCode: 400, Message: "The specified operation is not supported in this registry."},
 
 	// ELBv2 error codes
 	ErrorELBv2LoadBalancerNotFound:         {HTTPCode: 400, Message: "One or more load balancers not found."},
diff --git a/spinifex/config/config.go b/spinifex/config/config.go
index ed20b4e9a..0b9b03517 100644
--- a/spinifex/config/config.go
+++ b/spinifex/config/config.go
@@ -24,7 +24,7 @@ type ClusterConfig struct {
 // Defaults for cluster-wide AWS-parity settings.
 const (
 	DefaultAWSRegion         = "us-east-1"
-	DefaultAWSInternalSuffix = "mulga.internal"
+	DefaultAWSInternalSuffix = "spinifex.internal"
 )
 
 // AWSConfig holds cluster-wide AWS-parity settings shared across services.
diff --git a/spinifex/gateway/ecrapi/handler.go b/spinifex/gateway/ecrapi/handler.go
index b7deafd0a..4155352dd 100644
--- a/spinifex/gateway/ecrapi/handler.go
+++ b/spinifex/gateway/ecrapi/handler.go
@@ -36,6 +36,14 @@ func NotImplemented(_ *nats.Conn, _ string, _ []byte) (any, error) {
 	return nil, errors.New(awserrors.ErrorNotImplemented)
 }
 
+// ScanningNotSupported is the handler for the ECR image-scanning surface. mulga
+// runs no vulnerability scanner, so these actions return the AWS
+// OperationNotSupportedException (400) rather than NotImplemented (501): clients
+// and the console read it as a deliberately-off feature, not a server fault.
+func ScanningNotSupported(_ *nats.Conn, _ string, _ []byte) (any, error) {
+	return nil, errors.New(awserrors.ErrorOperationNotSupported)
+}
+
 // Actions is the authoritative ECR control-plane action namespace. Real
 // implementations replace the NotImplemented value as each action lands; the
 // key set is the v1 API contract.
@@ -70,21 +78,27 @@ var Actions = map[string]Handler{
 	"PutRegistryPolicy":      NotImplemented,
 	"DescribeRegistry":       NotImplemented,
 
-	// Deferred-feature surface (image scan, lifecycle, replication, tagging).
-	"PutImageScanningConfiguration": NotImplemented,
-	"GetImageScanningConfiguration": NotImplemented,
-	"StartImageScan":                NotImplemented,
-	"DescribeImageScanFindings":     NotImplemented,
-	"PutLifecyclePolicy":            PutLifecyclePolicy,
-	"GetLifecyclePolicy":            GetLifecyclePolicy,
-	"DeleteLifecyclePolicy":         DeleteLifecyclePolicy,
-	"StartLifecyclePolicyPreview":   NotImplemented,
-	"GetLifecyclePolicyPreview":     NotImplemented,
-	"PutReplicationConfiguration":   NotImplemented,
-	"ReplicateImage":                NotImplemented,
-	"TagResource":                   NotImplemented,
-	"UntagResource":                 NotImplemented,
-	"ListTagsForResource":           NotImplemented,
+	// Image scanning is unsupported (no scanner backend): the whole scan surface
+	// returns OperationNotSupportedException rather than NotImplemented.
+	"PutImageScanningConfiguration":           ScanningNotSupported,
+	"GetImageScanningConfiguration":           ScanningNotSupported,
+	"StartImageScan":                          ScanningNotSupported,
+	"DescribeImageScanFindings":               ScanningNotSupported,
+	"GetRegistryScanningConfiguration":        ScanningNotSupported,
+	"PutRegistryScanningConfiguration":        ScanningNotSupported,
+	"BatchGetRepositoryScanningConfiguration": ScanningNotSupported,
+
+	// Deferred-feature surface (lifecycle, replication, tagging).
+	"PutLifecyclePolicy":          PutLifecyclePolicy,
+	"GetLifecyclePolicy":          GetLifecyclePolicy,
+	"DeleteLifecyclePolicy":       DeleteLifecyclePolicy,
+	"StartLifecyclePolicyPreview": NotImplemented,
+	"GetLifecyclePolicyPreview":   NotImplemented,
+	"PutReplicationConfiguration": NotImplemented,
+	"ReplicateImage":              NotImplemented,
+	"TagResource":                 NotImplemented,
+	"UntagResource":               NotImplemented,
+	"ListTagsForResource":         NotImplemented,
 }
 
 // WriteJSONResponse serialises obj as a 200 AWS JSON 1.1 response using the
diff --git a/spinifex/gateway/ecrapi/handler_test.go b/spinifex/gateway/ecrapi/handler_test.go
index cf55bb348..e52d9c25c 100644
--- a/spinifex/gateway/ecrapi/handler_test.go
+++ b/spinifex/gateway/ecrapi/handler_test.go
@@ -34,6 +34,29 @@ func TestActions_CoreRegisteredAsStub(t *testing.T) {
 	}
 }
 
+func TestScanningNotSupported(t *testing.T) {
+	out, err := ScanningNotSupported(nil, "123456789012", []byte("{}"))
+	assert.Nil(t, out)
+	require.Error(t, err)
+	assert.Equal(t, awserrors.ErrorOperationNotSupported, err.Error())
+}
+
+func TestActions_ScanSurfaceUnsupported(t *testing.T) {
+	scan := []string{
+		"PutImageScanningConfiguration", "GetImageScanningConfiguration",
+		"StartImageScan", "DescribeImageScanFindings",
+		"GetRegistryScanningConfiguration", "PutRegistryScanningConfiguration",
+		"BatchGetRepositoryScanningConfiguration",
+	}
+	for _, action := range scan {
+		h, ok := Actions[action]
+		require.True(t, ok, "action %q should be registered", action)
+		_, err := h(nil, "123456789012", nil)
+		assert.Equal(t, awserrors.ErrorOperationNotSupported, err.Error(),
+			"action %q should resolve to the OperationNotSupported stub", action)
+	}
+}
+
 func TestWriteJSONResponse(t *testing.T) {
 	type repo struct {
 		RepositoryName *string `locationName:"repositoryName" type:"string"`
diff --git a/spinifex/gateway/ecrauth/ecrauth_test.go b/spinifex/gateway/ecrauth/ecrauth_test.go
index c21e78217..d34a0aa4c 100644
--- a/spinifex/gateway/ecrauth/ecrauth_test.go
+++ b/spinifex/gateway/ecrauth/ecrauth_test.go
@@ -13,7 +13,7 @@ import (
 	"github.com/stretchr/testify/require"
 )
 
-const testAudience = "ecr.ap-southeast-2.mulga.internal"
+const testAudience = "ecr.ap-southeast-2.spinifex.internal"
 
 var testMasterKey = func() []byte {
 	k := make([]byte, 32)
@@ -102,7 +102,7 @@ func TestVerifier_RejectsWrongAudience(t *testing.T) {
 	tok, _, err := NewIssuer(key, testAudience).Mint(samplePrincipal())
 	require.NoError(t, err)
 
-	_, err = NewVerifier(verify, "ecr.us-east-1.mulga.internal").Verify(tok)
+	_, err = NewVerifier(verify, "ecr.us-east-1.spinifex.internal").Verify(tok)
 	require.Error(t, err)
 }
 
diff --git a/spinifex/gateway/ecrauth_middleware_test.go b/spinifex/gateway/ecrauth_middleware_test.go
index ca15ad3d1..baa445dc3 100644
--- a/spinifex/gateway/ecrauth_middleware_test.go
+++ b/spinifex/gateway/ecrauth_middleware_test.go
@@ -16,7 +16,7 @@ import (
 
 const (
 	ecrTestRegion   = "ap-southeast-2"
-	ecrTestSuffix   = "mulga.internal"
+	ecrTestSuffix   = "spinifex.internal"
 	ecrTestAudience = "ecr." + ecrTestRegion + "." + ecrTestSuffix
 	ecrTestAccount  = "000000000001"
 )
diff --git a/spinifex/gateway/gateway.go b/spinifex/gateway/gateway.go
index d6abadb9b..50f484da0 100644
--- a/spinifex/gateway/gateway.go
+++ b/spinifex/gateway/gateway.go
@@ -76,7 +76,7 @@ type GatewayConfig struct {
 	Config         string     // Shared AWS Gateway config for S3 auth
 	ExpectedNodes  int        // Number of expected spinifex nodes for multi-node operations
 	Region         string     // Region this gateway is running in
-	InternalSuffix string     // Internal DNS suffix for AWS-parity endpoints (e.g. mulga.internal)
+	InternalSuffix string     // Internal DNS suffix for AWS-parity endpoints (e.g. spinifex.internal)
 	AZ             string     // Availability zone this gateway is running in
 	IAMService     handlers_iam.IAMService
 	STSService     handlers_sts.STSService
diff --git a/spinifex/gateway/hostmatch_test.go b/spinifex/gateway/hostmatch_test.go
index c9fee8cbf..afa46f357 100644
--- a/spinifex/gateway/hostmatch_test.go
+++ b/spinifex/gateway/hostmatch_test.go
@@ -19,16 +19,16 @@ func TestParseRegistryHost(t *testing.T) {
 	}{
 		{
 			name:     "match with suffix",
-			host:     "123456789012.dkr.ecr.us-east-1.mulga.internal",
-			suffix:   "mulga.internal",
+			host:     "123456789012.dkr.ecr.us-east-1.spinifex.internal",
+			suffix:   "spinifex.internal",
 			wantAcct: "123456789012",
 			wantRegn: "us-east-1",
 			wantOK:   true,
 		},
 		{
 			name:     "match strips port",
-			host:     "123456789012.dkr.ecr.us-east-1.mulga.internal:9999",
-			suffix:   "mulga.internal",
+			host:     "123456789012.dkr.ecr.us-east-1.spinifex.internal:9999",
+			suffix:   "spinifex.internal",
 			wantAcct: "123456789012",
 			wantRegn: "us-east-1",
 			wantOK:   true,
@@ -43,26 +43,26 @@ func TestParseRegistryHost(t *testing.T) {
 		},
 		{
 			name:   "control plane host is not a registry host",
-			host:   "ecr.us-east-1.mulga.internal",
-			suffix: "mulga.internal",
+			host:   "ecr.us-east-1.spinifex.internal",
+			suffix: "spinifex.internal",
 			wantOK: false,
 		},
 		{
 			name:   "wrong suffix does not match",
 			host:   "123456789012.dkr.ecr.us-east-1.other.internal",
-			suffix: "mulga.internal",
+			suffix: "spinifex.internal",
 			wantOK: false,
 		},
 		{
 			name:   "missing dkr.ecr labels",
-			host:   "123456789012.foo.bar.us-east-1.mulga.internal",
-			suffix: "mulga.internal",
+			host:   "123456789012.foo.bar.us-east-1.spinifex.internal",
+			suffix: "spinifex.internal",
 			wantOK: false,
 		},
 		{
 			name:   "empty host",
 			host:   "",
-			suffix: "mulga.internal",
+			suffix: "spinifex.internal",
 			wantOK: false,
 		},
 		{
@@ -95,7 +95,7 @@ func TestParseRegistryHost(t *testing.T) {
 func TestHostMatch_PopulatesContextOnRegistryHost(t *testing.T) {
 	t.Parallel()
 
-	gw := &GatewayConfig{InternalSuffix: "mulga.internal"}
+	gw := &GatewayConfig{InternalSuffix: "spinifex.internal"}
 
 	var gotAcct, gotRegn string
 	var acctOK, regnOK bool
@@ -105,7 +105,7 @@ func TestHostMatch_PopulatesContextOnRegistryHost(t *testing.T) {
 	})
 
 	req := httptest.NewRequest(http.MethodGet, "/v2/", nil)
-	req.Host = "123456789012.dkr.ecr.us-east-1.mulga.internal"
+	req.Host = "123456789012.dkr.ecr.us-east-1.spinifex.internal"
 	gw.hostMatch(next).ServeHTTP(httptest.NewRecorder(), req)
 
 	if !acctOK || gotAcct != "123456789012" {
@@ -119,7 +119,7 @@ func TestHostMatch_PopulatesContextOnRegistryHost(t *testing.T) {
 func TestHostMatch_PassesThroughNonRegistryHost(t *testing.T) {
 	t.Parallel()
 
-	gw := &GatewayConfig{InternalSuffix: "mulga.internal"}
+	gw := &GatewayConfig{InternalSuffix: "spinifex.internal"}
 
 	var hadAccount bool
 	next := http.HandlerFunc(func(_ http.ResponseWriter, r *http.Request) {
@@ -127,7 +127,7 @@ func TestHostMatch_PassesThroughNonRegistryHost(t *testing.T) {
 	})
 
 	req := httptest.NewRequest(http.MethodGet, "/v2/", nil)
-	req.Host = "ecr.us-east-1.mulga.internal"
+	req.Host = "ecr.us-east-1.spinifex.internal"
 	gw.hostMatch(next).ServeHTTP(httptest.NewRecorder(), req)
 
 	if hadAccount {
diff --git a/spinifex/services/spinifexui/frontend/src/routes/_auth/ecr/(repositories)/-components/repository-detail-page.test.tsx b/spinifex/services/spinifexui/frontend/src/routes/_auth/ecr/(repositories)/-components/repository-detail-page.test.tsx
index d55e8cf45..4f47343c4 100644
--- a/spinifex/services/spinifexui/frontend/src/routes/_auth/ecr/(repositories)/-components/repository-detail-page.test.tsx
+++ b/spinifex/services/spinifexui/frontend/src/routes/_auth/ecr/(repositories)/-components/repository-detail-page.test.tsx
@@ -78,6 +78,14 @@ describe("RepositoryDetailPage", () => {
     expect(screen.getByText("No images pushed yet.")).toBeInTheDocument()
   })
 
+  it("shows scanning is unsupported on the Scan tab", () => {
+    renderWithClient(<RepositoryDetailPage repositoryName={REPO} />, seed([]))
+    fireEvent.click(screen.getByRole("tab", { name: "Scan" }))
+    expect(
+      screen.getByText(/Vulnerability scanning is not supported/),
+    ).toBeInTheDocument()
+  })
+
   it("opens the delete-image confirmation", () => {
     renderWithClient(
       <RepositoryDetailPage repositoryName={REPO} />,
diff --git a/spinifex/services/spinifexui/frontend/src/routes/_auth/ecr/(repositories)/-components/repository-detail-page.tsx b/spinifex/services/spinifexui/frontend/src/routes/_auth/ecr/(repositories)/-components/repository-detail-page.tsx
index a77a37b78..33f4e14e8 100644
--- a/spinifex/services/spinifexui/frontend/src/routes/_auth/ecr/(repositories)/-components/repository-detail-page.tsx
+++ b/spinifex/services/spinifexui/frontend/src/routes/_auth/ecr/(repositories)/-components/repository-detail-page.tsx
@@ -26,6 +26,7 @@ import {
 import { LifecyclePolicyEditor } from "./lifecycle-policy-editor"
 import { RepositoryPolicyEditor } from "./repository-policy-editor"
 import { RepositorySummary } from "./repository-summary"
+import { ScanFindings } from "./scan-findings"
 
 interface RepositoryDetailPageProps {
   repositoryName: string
@@ -82,6 +83,7 @@ export function RepositoryDetailPage({
           <TabsTab value="summary">Summary</TabsTab>
           <TabsTab value="images">Images</TabsTab>
           <TabsTab value="lifecycle">Lifecycle</TabsTab>
+          <TabsTab value="scan">Scan</TabsTab>
           <TabsTab value="permissions">Permissions</TabsTab>
         </TabsList>
 
@@ -154,6 +156,10 @@ export function RepositoryDetailPage({
           <LifecyclePolicyEditor repositoryName={repositoryName} />
         </TabsPanel>
 
+        <TabsPanel value="scan">
+          <ScanFindings />
+        </TabsPanel>
+
         <TabsPanel value="permissions">
           <RepositoryPolicyEditor repositoryName={repositoryName} />
         </TabsPanel>
diff --git a/spinifex/services/spinifexui/frontend/src/routes/_auth/ecr/(repositories)/-components/scan-findings.tsx b/spinifex/services/spinifexui/frontend/src/routes/_auth/ecr/(repositories)/-components/scan-findings.tsx
new file mode 100644
index 000000000..bf0f9c40b
--- /dev/null
+++ b/spinifex/services/spinifexui/frontend/src/routes/_auth/ecr/(repositories)/-components/scan-findings.tsx
@@ -0,0 +1,15 @@
+// ScanFindings is the Scan tab of the repository detail page. mulga's registry
+// runs no vulnerability scanner, so the ECR scan API returns
+// OperationNotSupportedException. Rather than fire a request that surfaces a red
+// error, the tab states plainly that scanning is unavailable.
+export function ScanFindings() {
+  return (
+    <div className="rounded-lg border bg-card p-4">
+      <h2 className="mb-2 text-sm font-medium">Image scanning</h2>
+      <p className="text-sm text-muted-foreground">
+        Vulnerability scanning is not supported by this registry. Pushed images
+        are stored and served without scan findings.
+      </p>
+    </div>
+  )
+}