diff --git a/src/server.tsx b/src/server.tsx
index a9032d1..520665f 100644
--- a/src/server.tsx
+++ b/src/server.tsx
@@ -18,15 +18,14 @@ type Response = {
     body: string
 }
 
+type Success = {
+    subdomain: string
+}
+
 type Connection = { app: string, ws: any }
 let connections: Record<string, Connection> = {}
 const pending = new Map<string, (res: any) => void>
 
-function send(connection: any, msg: Request) {
-    console.log("sending", msg)
-    connection.send(JSON.stringify(msg))
-}
-
 const app = new Hono
 
 app.get("/tunnel", c => {
@@ -40,6 +39,7 @@ app.get("/tunnel", c => {
             const name = randomName()
             connections[name] = { app, ws }
             console.log(`connection opened: ${name} -> ${app}`)
+            send(ws, { subdomain: name })
         },
         onClose: (_event, ws) => {
             for (const name of Object.keys(connections))
@@ -96,6 +96,12 @@ app.get("*", async c => {
     })
 })
 
+function send(connection: any, msg: Request | Success) {
+    console.log("sending", msg)
+    connection.send(JSON.stringify(msg))
+}
+
+
 function randomID(): string {
     return Math.random().toString(36).slice(2, 10)
 }