How To Find All IP Addresses on Linux

Run the command:
ip address show
In the output you will find lines like these:
inet 127.0.0.1/8 scope host lo
inet 192.168.1.10/24 brd 192.168.1.255 scope global eth1

The highlighted portions are your (ipv4) ip addresses.

The /8 or /24 represents your network. /8 means your subnet mask is 255.0.0.0 and /24 means your subnet mask is 255.255.255.0. You will not have a subnet typically for a point-to-point connection.

Note: The lines containing inet6 provides the ipv6 addresses.