This post is about how to get IP address, subnet and related network information in Linux.
Ifconfig – Linux command:
On Linux, to check or find out the IP address, you must use the “/ sbin / ifconfig“ command. The MAC address, subnet mask and other information are also displayed.
Output example
[[email protected] ~]# /sbin/ifconfig eth0: flags=4163<UP,BROADCAST,RUNNING,MULTICAST> mtu 1500 inet 213.159.209.228 netmask 255.255.254.0 broadcast 213.159.209.255 inet6 fe80::5054:ff:fe80:19a4 prefixlen 64 scopeid 0x20<link> ether 52:54:00:80:19:a4 txqueuelen 1000 (Ethernet) RX packets 306877603 bytes 20085789908 (18.7 GiB) RX errors 0 dropped 0 overruns 0 frame 0 TX packets 14979556 bytes 128723797704 (119.8 GiB) TX errors 0 dropped 0 overruns 0 carrier 0 collisions 0 lo: flags=73<UP,LOOPBACK,RUNNING> mtu 65536 inet 127.0.0.1 netmask 255.0.0.0 inet6 ::1 prefixlen 128 scopeid 0x10<host> loop txqueuelen 1 (Local Loopback) RX packets 10034610 bytes 35020478823 (32.6 GiB) RX errors 0 dropped 0 overruns 0 frame 0 TX packets 10034610 bytes 35020478823 (32.6 GiB) TX errors 0 dropped 0 overruns 0 carrier 0 collisions 0 [[email protected] ~]#
To get only the IP address:
[[email protected] ~]# /sbin/ifconfig|grep -v "127.0.0.1"|grep -i "inet addr" inet addr:213.159.209.228 Bcast:213.159.209.255 Mask:255.255.255.0 [[email protected] ~]#
According to the conclusion above “ 192.168.49.180 ”Is the IP address of the Linux system that is currently assigned to the interface eth0 …
In case you have more than one interface card or Ethernet card, for example eth0, eth1… ETHN. Then, to get the IP address of a specific Ethernet you need to specify in the IFCONFIG command as shown below.
[[email protected] ~]# /sbin/ifconfig eth0 eth0: flags=4163<UP,BROADCAST,RUNNING,MULTICAST> mtu 1500 inet 213.159.209.228 netmask 255.255.254.0 broadcast 213.159.209.255 inet6 fe80::5054:ff:fe80:19a4 prefixlen 64 scopeid 0x20<link> ether 52:54:00:80:19:a4 txqueuelen 1000 (Ethernet) RX packets 306923321 bytes 20088708252 (18.7 GiB) RX errors 0 dropped 0 overruns 0 frame 0 TX packets 14980805 bytes 128725514772 (119.8 GiB) TX errors 0 dropped 0 overruns 0 carrier 0 collisions 0 [[email protected] ~]#
ip addr show – command in Linux to get the IP address:
As recommended, we should use ip addr show on Linux to get the IP address.
[[email protected] ~]# ip addr show 1: lo: <LOOPBACK,UP,LOWER_UP> mtu 16436 qdisc noqueue link/loopback 00:00:00:00:00:00 brd 00:00:00:00:00:00 inet 127.0.0.1/8 scope host lo 2: eth0: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc pfifo_fast qlen 1000 link/ether 00:50:5b:ab:70:ba brd ff:ff:ff:ff:ff:ff inet 192.168.49.180/22 brd 192.168.51.255 scope global eth0
ip rl – Linux command to get IP address:
There is one easier-to-use command in Linux to get or find an IP address, as shown below:
[[email protected] ~]# ip r l 213.159.209.0/22 dev eth0 proto kernel scope link src 213.159.209.228 default via 213.159.209.1 dev eth0 [[email protected] ~]#
