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Port numbers can be used by various software, but the specific port 11501 is not registered with the IANA for a widely known, universal service. However, it does appear in several specific commercial and open-source contexts:
If the service is running, you can typically reach it by typing http://localhost:11501 directly into your browser's address bar. localhost 11501 new
In 2021, the create-t3-app boilerplate briefly used 11501 as a fallback if 3000 was busy. Thousands of developers saw that fallback and kept it.
const express = require('express'); const app = express(); const PORT = process.env.PORT || 11501; app.listen(PORT, '127.0.0.1', () => console.log(`New service running at http://localhost:$PORT`); ); Use code with caution. Would you like a shorter tweet-sized version or
A Next.js 15 app. But instead of 3000 , it runs on 11501 . She aliased it in package.json : "dev": "next dev -p 11501" . No reason except that her .config/postgres already uses 5432 and her Redis uses 6379 . She wanted a port that would never appear in a tutorial—forcing her to actually read her own URLs.
const express = require('express'); const app = express(); const PORT = 11501; app.get('/', (req, res) => res.send('New Localhost 11501 Instance is Active!'); ); app.listen(PORT, () => console.log(`Server is running locally at http://localhost:$PORT`); ); Use code with caution. 2. Python (Built-in HTTP Server) In 2021, the create-t3-app boilerplate briefly used 11501
: The port number is used to differentiate between many different IP services running on a single computer. In this case, 11501 specifies a particular service or application running on your local machine.
Tagline: Local build live at localhost:11501 — iterate fast, ship safely.
Released to help standardize local development, locport (and tools like it) introduces a clean, simple convention to solve the problem of "which port is my app running on?"