IP addresses in Internet Protocol (IP) version 4 (IPv4) range from 0.0.0.0 to 255.255.255.255. The IP address 0.0.0.0 has several special meanings on computer networks. However, it cannot be used as a general device address.
0.0.0.0 vs 127.0.0.1 || Local host || Special IP addresses 2
This IP address is structured like a normal address (it has four places for numbers). However, it is a placeholder or an address used to describe that no normal address has been assigned, neither public nor private. For example, instead of not putting an IP address in a program's network area, 0.0.0.0 could be used to mean anything from accepting all IP addresses to blocking all IP addresses to the default route.
It is easy to confuse 0.0.0.0 and 127.0.0.1. An address with four zeros has several defined uses (as described below), while 127.0.0.1 has one specific purpose, which is to allow a device to send messages to itself.
In short, 0.0.0.0 is a non-routable address that describes an invalid or unknown destination. However, it means something different depending on whether it is seen on a client device such as a computer or on a server machine.
