diff --git a/src/server/trpc/routers/website.ts b/src/server/trpc/routers/website.ts
index f042188..347e622 100644
--- a/src/server/trpc/routers/website.ts
+++ b/src/server/trpc/routers/website.ts
@@ -6,6 +6,7 @@ import {
   EVENT_COLUMNS,
   FILTER_COLUMNS,
   SESSION_COLUMNS,
+  hostnameRegex,
 } from '../../utils/const';
 import { parseDateRange } from '../../utils/common';
 import { getSessionMetrics, getPageviewMetrics } from '../../model/website';
@@ -160,7 +161,10 @@ export const websiteRouter = router({
       z.object({
         websiteId: z.string().cuid2(),
         name: z.string().max(100),
-        domain: z.union([z.string().max(500).url(), z.string().max(500).ip()]),
+        domain: z.union([
+          z.string().max(500).regex(hostnameRegex),
+          z.string().max(500).ip(),
+        ]),
         monitorId: z.string().cuid2().nullish(),
       })
     )
diff --git a/src/server/utils/const.ts b/src/server/utils/const.ts
index f05fb01..0ca870d 100644
--- a/src/server/utils/const.ts
+++ b/src/server/utils/const.ts
@@ -117,3 +117,6 @@ export const DEFAULT_RESET_DATE = '2000-01-01';
 export enum OPENAPI_TAG {
   USER = 'User',
 }
+
+export const hostnameRegex =
+  /^(([a-zA-Z0-9]|[a-zA-Z0-9][a-zA-Z0-9\-]*[a-zA-Z0-9])\.)*([A-Za-z0-9]|[A-Za-z0-9][A-Za-z0-9\-]*[A-Za-z0-9])$/gim;