Find Primary IP Address of a Linux Machine

Network Interface Overview

$ ip address show

1: lo: <LOOPBACK,UP,LOWER_UP> mtu 65536 qdisc noqueue state UNKNOWN group default qlen 1000
    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 noprefixroute 
       valid_lft forever preferred_lft forever
2: enp1s0: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc fq_codel state UP group default qlen 1000
    link/ether b0:41:6f:0b:90:b2 brd ff:ff:ff:ff:ff:ff
    inet 192.168.10.67/24 brd 192.168.10.255 scope global dynamic noprefixroute enp1s0
       valid_lft 83831sec preferred_lft 83831sec
    inet6 fe80::6ab2:6114:33ae:d860/64 scope link noprefixroute 
       valid_lft forever preferred_lft forever

 

The Primary Network Interface

$ route

Kernel IP routing table
Destination     Gateway         Genmask         Flags Metric Ref    Use Iface
default         _gateway        0.0.0.0         UG    100    0        0 ens33
link-local      0.0.0.0         255.255.0.0     U     1000   0        0 ens33
192.168.207.0   0.0.0.0         255.255.255.0   U     100    0        0 ens33

 

External IP Address

$ curl ifconfig.me

220.158.158.132