Find the IP Addresses of the Available Network Interfaces of your Linux System

To find the ip addresses of the available network interfaces on Linux, use the following command,

sudo ip addr show

1: lo:  mtu 65536 qdisc noqueue state UNKNOWN 
    link/loopback 00:00:00:00:00:00 brd 00:00:00:00:00:00
    inet 127.0.0.1/8 scope host lo
       valid_lft forever preferred_lft forever
    inet6 ::1/128 scope host 
       valid_lft forever preferred_lft forever
2: enp0s3:  mtu 1500 qdisc pfifo_fast state UP qlen 1000
    link/ether 08:00:27:45:4e:87 brd ff:ff:ff:ff:ff:ff
    inet 10.0.2.15/24 brd 10.0.2.255 scope global dynamic enp0s3
       valid_lft 86403sec preferred_lft 86403sec
    inet6 fe80::a00:27ff:fe45:4e87/64 scope link 
       valid_lft forever preferred_lft forever
3: virbr0:  mtu 1500 qdisc noqueue state DOWN 
    link/ether 00:00:00:00:00:00 brd ff:ff:ff:ff:ff:ff
    inet 192.168.122.1/24 brd 192.168.122.255 scope global virbr0
       valid_lft forever preferred_lft forever
4: virbr0-nic:  mtu 1500 qdisc pfifo_fast state DOWN qlen 500
    link/ether 52:54:00:bb:2e:64 brd ff:ff:ff:ff:ff:ff

You can see that, the result shows the network interfaces with numbers 1,2,3,4 and so on. I have 4 network interfaces on my Linux system.

You can see lines that start with inet or inet6. These lines represent ipv4 and ipv6 addresses respectively.

The first network interface which is a loopback interface has an ipv4 address of 127.0.0.1 and an ipv6 address of ::1

The second network interface enp0s3 has an ipv4 address of 10.0.2.15 and an ipv6 address of fe80::a00:27ff:fe45:4e87

The third network interface virbr0 has an ipv4 address of 192.168.122.1. It doesn't have an ipv6 address set.

The fourth network interface virbr0-nic doesn't have any ip address set at the moment.