diff --git a/CONTRIBUTING.md b/CONTRIBUTING.md
index ed28e9d6..72502f96 100644
--- a/CONTRIBUTING.md
+++ b/CONTRIBUTING.md
@@ -7,7 +7,7 @@ Thanks for your interest in contributing! This guide explains how to get involve
 1. Fork the repository and clone it locally
 2. Install dependencies with `npm install`
 3. Run `npm run dev` to start both client and server in development mode
-4. Use the web UI at http://127.0.0.1:5173 to interact with the inspector
+4. Use the web UI at http://127.0.0.1:6274 to interact with the inspector
 
 ## Development Process & Pull Requests
 
diff --git a/README.md b/README.md
index 5fe36933..01920382 100644
--- a/README.md
+++ b/README.md
@@ -30,7 +30,7 @@ npx @modelcontextprotocol/inspector -e KEY=value -e KEY2=$VALUE2 node build/inde
 npx @modelcontextprotocol/inspector -e KEY=$VALUE -- node build/index.js -e server-flag
 ```
 
-The inspector runs both a client UI (default port 5173) and an MCP proxy server (default port 3000). Open the client UI in your browser to use the inspector. You can customize the ports if needed:
+The inspector runs both an MCP Inspector (MCPI) client UI (default port 6274) and an MCP Proxy (MPCP) server (default port 6727). Open the MCPI client UI in your browser to use the inspector. (These ports are derived from the T9 dialpad mapping of MCPI and MPCP respectively, as a mnemonic). You can customize the ports if needed:
 
 ```bash
 CLIENT_PORT=8080 SERVER_PORT=9000 npx @modelcontextprotocol/inspector node build/index.js
diff --git a/bin/cli.js b/bin/cli.js
index 1b744ced..b495f7b4 100755
--- a/bin/cli.js
+++ b/bin/cli.js
@@ -61,8 +61,8 @@ async function main() {
     "cli.js",
   );
 
-  const CLIENT_PORT = process.env.CLIENT_PORT ?? "5173";
-  const SERVER_PORT = process.env.SERVER_PORT ?? "3000";
+  const CLIENT_PORT = process.env.CLIENT_PORT ?? "6274";
+  const SERVER_PORT = process.env.SERVER_PORT ?? "6727";
 
   console.log("Starting MCP inspector...");
 
@@ -100,7 +100,7 @@ async function main() {
 
   // Make sure our server/client didn't immediately fail
   await Promise.any([server, client, delay(2 * 1000)]);
-  const portParam = SERVER_PORT === "3000" ? "" : `?proxyPort=${SERVER_PORT}`;
+  const portParam = SERVER_PORT === "6727" ? "" : `?proxyPort=${SERVER_PORT}`;
   console.log(
     `\n🔍 MCP Inspector is up and running at http://127.0.0.1:${CLIENT_PORT}${portParam} 🚀`,
   );
diff --git a/client/bin/cli.js b/client/bin/cli.js
index 7dc93eab..81b7bd11 100755
--- a/client/bin/cli.js
+++ b/client/bin/cli.js
@@ -15,5 +15,5 @@ const server = http.createServer((request, response) => {
   });
 });
 
-const port = process.env.PORT || 5173;
+const port = process.env.PORT || 6274;
 server.listen(port, () => {});
diff --git a/client/src/App.tsx b/client/src/App.tsx
index c29ef71b..f65bdc29 100644
--- a/client/src/App.tsx
+++ b/client/src/App.tsx
@@ -49,7 +49,7 @@ import { DEFAULT_INSPECTOR_CONFIG } from "./lib/constants";
 import { InspectorConfig } from "./lib/configurationTypes";
 
 const params = new URLSearchParams(window.location.search);
-const PROXY_PORT = params.get("proxyPort") ?? "3000";
+const PROXY_PORT = params.get("proxyPort") ?? "6727";
 const PROXY_SERVER_URL = `http://${window.location.hostname}:${PROXY_PORT}`;
 const CONFIG_LOCAL_STORAGE_KEY = "inspectorConfig_v1";
 
diff --git a/server/src/index.ts b/server/src/index.ts
index 2a4fe658..7a527fc5 100644
--- a/server/src/index.ts
+++ b/server/src/index.ts
@@ -182,7 +182,7 @@ app.get("/config", (req, res) => {
   }
 });
 
-const PORT = process.env.PORT || 3000;
+const PORT = process.env.PORT || 6727;
 
 try {
   const server = app.listen(PORT);