diff --git a/src/modules/auth/orchest-identity.spec.ts b/src/modules/auth/orchest-identity.spec.ts
index f7ec418..abcf98d 100644
--- a/src/modules/auth/orchest-identity.spec.ts
+++ b/src/modules/auth/orchest-identity.spec.ts
@@ -3,6 +3,9 @@ import {
   moduleGateSeqid,
   isModuleAllowed,
   isAdmin,
+  tenantOrchestApiHost,
+  isAllowedOrchestApiHost,
+  namespaceModule,
 } from './orchest-identity';
 
 describe('orchest-identity mapping', () => {
@@ -31,3 +34,43 @@ describe('orchest-identity mapping', () => {
     expect(isAdmin([99], [34, 99])).toBe(true);
   });
 });
+
+describe('orchest-identity tenant routing', () => {
+  it('namespaceModule default and values', () => {
+    expect(namespaceModule(undefined)).toBe('intelli');
+    expect(namespaceModule('process')).toBe('process');
+    expect(namespaceModule('garbage')).toBe('intelli');
+  });
+
+  it('tenantOrchestApiHost builds the namespace pattern', () => {
+    expect(tenantOrchestApiHost('acme', 'intelli')).toBe(
+      'orchest-api.orchest-intelli-acme.svc.cluster.local',
+    );
+    expect(tenantOrchestApiHost('acme', 'process')).toBe(
+      'orchest-api.orchest-process-acme.svc.cluster.local',
+    );
+  });
+
+  it('tenantOrchestApiHost normalizes a non-slug customer_name', () => {
+    expect(tenantOrchestApiHost('Acme Corp', 'intelli')).toBe(
+      'orchest-api.orchest-intelli-acme-corp.svc.cluster.local',
+    );
+  });
+
+  it('isAllowedOrchestApiHost guards against malformed values', () => {
+    expect(
+      isAllowedOrchestApiHost(
+        'orchest-api.orchest-intelli-acme.svc.cluster.local',
+      ),
+    ).toBe(true);
+    expect(isAllowedOrchestApiHost('evil.example.com')).toBe(false);
+    expect(
+      isAllowedOrchestApiHost('orchest-api.orchest-intelli-.svc.cluster.local'),
+    ).toBe(false);
+    expect(
+      isAllowedOrchestApiHost(
+        'orchest-api.orchest-other-acme.svc.cluster.local',
+      ),
+    ).toBe(false);
+  });
+});
diff --git a/src/modules/auth/orchest-identity.ts b/src/modules/auth/orchest-identity.ts
index cfe3248..7a75c14 100644
--- a/src/modules/auth/orchest-identity.ts
+++ b/src/modules/auth/orchest-identity.ts
@@ -32,3 +32,39 @@ export function isModuleAllowed(perms: number[], gateSeqid: number): boolean {
 export function isAdmin(perms: number[], adminSeqids: number[]): boolean {
   return Array.isArray(perms) && perms.some((p) => adminSeqids.includes(p));
 }
+
+/** The `{module}` slug in the tenant namespace pattern; default 'intelli'. */
+export function namespaceModule(
+  raw: string | undefined,
+): 'intelli' | 'process' {
+  return raw === 'process' ? 'process' : 'intelli';
+}
+
+/**
+ * The in-cluster DNS of the calling tenant's orchest-api, from the tenant
+ * namespace convention `orchest-{module}-{customer_name}`.
+ *
+ * `customer_name` is normalized to the namespace slug shape (lowercase,
+ * non-[a-z0-9-] → '-') so a display-name value still yields a valid host; a
+ * value that is already a clean slug is unchanged. NOTE: confirm the exact
+ * prod `customer_name` → namespace mapping against a real token before relying
+ * on this in production (the `dadosferademo2` tenant is a known exception and
+ * is unsupported — it is being removed).
+ */
+export function tenantOrchestApiHost(
+  customerName: string,
+  module: string,
+): string {
+  const slug = String(customerName)
+    .toLowerCase()
+    .replace(/[^a-z0-9-]/g, '-');
+  return `orchest-api.orchest-${module}-${slug}.svc.cluster.local`;
+}
+
+const ORCHEST_API_HOST_RE =
+  /^orchest-api\.orchest-(intelli|process)-[a-z0-9-]+\.svc\.cluster\.local$/;
+
+/** Defense in depth: only call an orchest-api host matching the convention. */
+export function isAllowedOrchestApiHost(host: string): boolean {
+  return ORCHEST_API_HOST_RE.test(host);
+}