diff --git a/server/routes/auth.js b/server/routes/auth.js
index 26a4fac..701b4e1 100644
--- a/server/routes/auth.js
+++ b/server/routes/auth.js
@@ -61,6 +61,9 @@ const registerSchema = Joi.object({
 // Initialize multi-tenant auth
 const multiAuth = new MultiTenantAuth();
 
+// Initialize IP restriction middleware
+const ipRestriction = new IPRestrictionMiddleware();
+
 // Session middleware for OAuth state management
 router.use(session({
   secret: process.env.SESSION_SECRET || 'your-session-secret',
@@ -253,7 +256,7 @@ router.post('/login', async (req, res, next) => {
  * POST /auth/register
  * Universal registration endpoint that routes to appropriate provider
  */
-router.post('/register', validateRequest(registerSchema), async (req, res, next) => {
+router.post('/register', validateRequest(registerSchema), ipRestriction.checkIPRestriction.bind(ipRestriction), async (req, res, next) => {
   try {
     // Determine tenant
     const tenantId = await multiAuth.determineTenant(req);