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I am on a Lan network so i was wondering if their is any way to know how many IP's have been allocated and how many IP's are free on the network via Terminal commands ? I am running Ubuntu OS. Thank You.

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You could use this to help you out: http://nmap.org/

Lets say you wish to search your network, which is 192.168.0.0/16 

nmap 192.168.0-255.1-254

example output:

Starting Nmap 5.21 ( http://nmap.org ) at 2012-06-09 12:36 CEST
Nmap scan report for DD-WRT (192.168.1.1)
Host is up (0.042s latency).
Not shown: 997 closed ports
PORT   STATE SERVICE
23/tcp open  telnet
53/tcp open  domain
80/tcp open  http

I never personally used it but it supposedly can help you map your network and you'll just need to know your network information to utilize it.

If you have a router and access to the router then you can access admin panel and check the DHCP clients for record information as well.

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  • I was wondering if i could do that with terminal commands ?
    – HakimuddinHussain
    Jun 9, 2012 at 10:00
  • Nmap can be run from the terminal. nmap.org/book/man-target-specification.html
    – bbaja42
    Jun 9, 2012 at 10:34
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    nmap -sP 192.168.1.0/16 is better. -sP only performs a ping and scans a couple of ports. By default, you're scanning many more per host, which takes longer.
    – Mike Pennington
    Jun 9, 2012 at 13:38

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