Why do not open pages on the local network shared with XIP.IO in MAMP PRO?

Question

network hardware

Here, everything is included:

On the computer itself, the page opens at the specified address. On other computers connected to the same router, no.
Maybe something needs to be changed in the router settings?
Although if the browser simply requests a page at http://IP_comp_with_web_server:81/, then the page on the losalhost host is successfully opened. That is, the router does not interfere.

Answer 1

It works locally - because I
don’t know the nuances of XIP.IO in hosts, but there is a suspicion that a client is required on all machines