The default internal loop IP for the localhost is usually 127.0. 0.1 . This IP is different from the IP that identifies the comput... MoodleDocs
It ensures that the person logged into the treasury system is physically using the authorized hardware.
If you’re following a 2021 tutorial for a project like a JAMstack app, OAuth testing (where providers require HTTPS callback URLs), or a PWA, they might have chosen 11501 to avoid conflicts.