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..b0e18deb 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 (MCPP) server (default port 6277). Open the MCPI client UI in your browser to use the inspector. (These ports are derived from the T9 dialpad mapping of MCPI and MCPP 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 8c5e5267..35edf0e9 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 ?? "6277";
 
   console.log("Starting MCP inspector...");
 
diff --git a/client/bin/cli.js b/client/bin/cli.js
index 95b64296..d30cc702 100755
--- a/client/bin/cli.js
+++ b/client/bin/cli.js
@@ -15,7 +15,7 @@ const server = http.createServer((request, response) => {
   });
 });
 
-const port = process.env.PORT || 5173;
+const port = process.env.PORT || 6274;
 server.on("listening", () => {
   console.log(
     `🔍 MCP Inspector is up and running at http://127.0.0.1:${port} 🚀`,
diff --git a/client/package.json b/client/package.json
index c268c339..eb0091fb 100644
--- a/client/package.json
+++ b/client/package.json
@@ -18,7 +18,7 @@
     "dev": "vite",
     "build": "tsc -b && vite build",
     "lint": "eslint .",
-    "preview": "vite preview --port 5173",
+    "preview": "vite preview --port 6274",
     "test": "jest --config jest.config.cjs",
     "test:watch": "jest --config jest.config.cjs --watch"
   },
diff --git a/client/src/App.tsx b/client/src/App.tsx
index c29ef71b..23c508f2 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") ?? "6277";
 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 1d16d23e..ee33930f 100644
--- a/server/src/index.ts
+++ b/server/src/index.ts
@@ -185,7 +185,7 @@ app.get("/config", (req, res) => {
   }
 });
 
-const PORT = process.env.PORT || 3000;
+const PORT = process.env.PORT || 6277;
 
 const server = app.listen(PORT);
 server.on("listening", () => {