Listed by IANA for specific applications, third-party software, and developer tools. Port 11501 falls directly into this range.
Some software environments are built around the concept of managed, exclusive ports. A Ruby-based tool called is a perfect example of this philosophy. It exists to "standardize localhost port management" for development projects. You can define a .localhost file in your project to list the specific hosts and ports your project needs, with a simple format like hello.localhost:11501 . localhost11501 exclusive
const express = require('express'); const app = express(); const PORT = 11501; app.listen(PORT, () => console.log(`Exclusive service running on http://localhost:$PORT`); ); Use code with caution. Python / Flask Listed by IANA for specific applications