IP address from hostname in UNIX
In this Unix command tutorial, we will see How to find IP address of
any host in a UNIX based system e.g. Linux, Solaris or IBM AIX. In general
hostname and IP address are two important things about any host in a UNIX based
network. You always need either hostname
or IP address to connect to any host. Some time you want to find IP address of
localhost, some time IP address of another host on network etc. We have shown
some techniques to find
IP address from hostname in UNIX and here we will see is particular list of
UNIX commands to get IP address of localhost or host on which you are working along
with any other host for which we know hostname.
List of UNIX command to find IP address from hostname
Here is list of UNIX
command which can be used to find IP address :
ifconfig
nslookup
hostname
ifconfig
command example
ifconfig command shows lot of information
about various NIC cards in system, you can check either for "inet" or "inet
addr" for seeing IP address to respective NIC cards :
# /usr/sbin/ifconfig -a
inet 192.52.32.15 netmask ffffff00 broadcast 192.52.32.255
inet 192.52.32.15 netmask ffffff00 broadcast 192.52.32.255
As I said ifconfig command shows lot of details but
I have only included relevant inet one, if you have more than
one network card attached to that host, you may see more than one inet
address corresponding to each of them. Main drawback of ifconfig command in
UNIX is that you can only get IP address of localhost from this command, you
can not get IP address of any other host.
grep
and hostname example
You can combine grep
command and hostname to look IP address from /etc/hosts file. here
`hostname` will return output of hostname command
and great will then search for that word in /etc/hostname. benefit
of using `hostname` is that you can just copy and run
this command on any host without typing hostname by yourself. This is one of
many great usage of grep in UNIX, see 10
ways to use grep command in UNIX to find out why grep is one of the most useful
command in UNIX.
# grep `hostname` /etc/hosts
192.52.32.15 nyk4035 nyk4035.unix.com
192.52.32.15 nyk4035 nyk4035.unix.com
ping
command example
Our plain old ping command can also be used to find IP address
of localhost or any other host provided you know the hostname. ping is used to
check wither target server is alive or not but while using with option -s it also display IP address of corresponding host as well. Ping
is actually one of the of 10
useful networking command in UNIX , see that link for other commands.
# ping -s `hostname`
PING nyk4035: 56 data bytes
64 bytes from nyk4035 (192.52.32.15): icmp_seq=0. time=0.186 ms
PING nyk4035: 56 data bytes
64 bytes from nyk4035 (192.52.32.15): icmp_seq=0. time=0.186 ms
nslookup
command example
nslookup is one of the primary UNIX
command to find
IP address from hostname and again from hostname to IP address. Similar to ping you can
also use nslookup command to find IP address of
both local host and remote host in any UNIX based system. nslookup is
generally available in most of UNIX based system e.g. Linux, Solaris, IBM AIX
or any other UNIX system.
# nslookup `hostname`
nyk4035.unix.com canonical name = nyk4035.unix.com
Name: nyk4035.unix.com
Address: 192.52.32.15
nyk4035.unix.com canonical name = nyk4035.unix.com
Name: nyk4035.unix.com
Address: 192.52.32.15
That's all on How to find IP address in UNIX , Linux and other UNIX
based system e.g. Solaris, IBM AIX, BSD etc. We have seen examples of
getting IP address from hostname by using ipconfig, ping, hostname and nslookup command.
If one command is not working in your machine you can always use other command or
you can simply cross check IP address by using multiple UNIX commands.
Other UNIX command tutorial you may like
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