How to Get the Ip Address of a (Linux) Machine

How to get the primary IP address of the local machine on Linux and OS X?

Use grep to filter IP address from ifconfig:

ifconfig | grep -Eo 'inet (addr:)?([0-9]*\.){3}[0-9]*' | grep -Eo '([0-9]*\.){3}[0-9]*' | grep -v '127.0.0.1'

Or with sed:

ifconfig | sed -En 's/127.0.0.1//;s/.*inet (addr:)?(([0-9]*\.){3}[0-9]*).*/\2/p'

If you are only interested in certain interfaces, wlan0, eth0, etc. then:

ifconfig wlan0 | ...

You can alias the command in your .bashrc to create your own command called myip for instance.

alias myip="ifconfig | sed -En 's/127.0.0.1//;s/.*inet (addr:)?(([0-9]*\.){3}[0-9]*).*/\2/p'"

A much simpler way is hostname -I (hostname -i for older versions of hostname but see comments). However, this is on Linux only.

How to get the ip address of the server in linux?

If you are trying to get this information from BASH, you probably want to use nslookup. For example:

[michaelsafyan@codemage ~]$ nslookup redmine.org
Server:     8.8.8.8
Address:    8.8.8.8#53

Non-authoritative answer:
Name:   redmine.org
Address: 46.4.36.71

I should add that an IP address does NOT represent a computer, but rather a network interface. And a computer can have any number of network interfaces (and IP addresses). Also, a website or domain may have many machines (and consequently many more network interaces and IP addresses). When querying with nslookup you will get at least one IP address for the given domain name (assuming DNS is working and it doesn't fail for one reason or another), but it won't necessarily give you all the addresses.

Which terminal command to get just IP address and nothing else?

You can write a script that only return the IP like:

/sbin/ifconfig eth0 | grep 'inet addr' | cut -d: -f2 | awk '{print $1}'

For MAC:

ifconfig | grep "inet " | grep -v 127.0.0.1 | cut -d\  -f2

Or for linux system

hostname -i | awk '{print $3}' # Ubuntu 

hostname -i # Debian

Get all ipaddress of a linux machine

I believe you should take a look on NetworkInterfaces class of Java.
You'll query for all available interfaces and enumerate over them to get the details (ip address in your case ) assigned to each one of there.

You can find example and explanations Here

Hope this helps

How to get a list of all valid IP addresses in a local network?

Install nmap,

sudo apt-get install nmap

then

nmap -sP 192.168.1.*

or more commonly

nmap -sn 192.168.1.0/24

will scan the entire .1 to .254 range

This does a simple ping scan in the entire subnet to see which hosts are online.

How can I find my IP address when inside a Server

This cyberciti.biz article Expline how to find your public IP address.

To show IP address of server use this command: ifconfig -a.

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