Isn't 127/8 always present in IPv4, without I'll consequences?

I meant it's one address per interface, and loopback has always been its own interface.

One address per host is more common in serious networks that don't have endless IP addresses (10/8 block) allocated to them.

	▲	dcrazy 26 minutes ago \| parent [-]
		There is no problem with allocating one 127.0.0.0/8 to every interface on your host, because 127.0.0.0/8 is only ever accessible to the host itself. So even if you have multi-homed a single routable IPv4 address to 2 NICs on your server (for redundancy), you can still assign 127.0.0.1 to the first and 127.0.0.2 for the second, which you can then use to bind a port to a specific interface in the pair. (I don’t know if anyone actually does this.)