Finding the IPs of other machines on my network

**utahcon** · 04-21-2005

I have a few servers on my network, and I was wondering if there was a way to "find" them (by IP).

I basically dont want to have to hook up my monitor to remember what the IP is.

BTW - I am doing this from command (terminal)

Thanks!

**serz** · 04-21-2005

How about this:

Code:

root@insitt&#58;~# nmap -sP 198.162.0.*

Starting nmap 3.81 &#40; http&#58;//www.insecure.org/nmap/ &#41; at 2005-04-21 13&#58;36 ART
Host insitt &#40;198.162.0.1&#41; appears to be up.
Host serzb0x &#40;198.162.0.2&#41; appears to be up.
MAC Address&#58; 00&#58;0C&#58;6E&#58;49&#58;3A&#58;05 &#40;Asustek Computer&#41;
Host zeol &#40;198.162.0.3&#41; appears to be up.
MAC Address&#58; 00&#58;80&#58;AD&#58;05&#58;42&#58;CD &#40;Cnet Technology&#41;
Host daniel &#40;198.162.0.8&#41; appears to be up.
MAC Address&#58; 00&#58;0E&#58;A6&#58;B6&#58;98&#58;CD &#40;Asustek Computer&#41;
Nmap finished&#58; 256 IP addresses &#40;4 hosts up&#41; scanned in 8.991 seconds

**sdousley** · 04-21-2005

i knew bout that command. and have used it myself in future.... but how do u get it to show the host names?? I have never worked out why it doesn't!

**serz** · 04-21-2005

You have to add them to your /etc/hosts file.

**sdousley** · 04-21-2005

well, i dont have the ip of all the computers on the network, but it doesn't show the ones that i do have in that file :s

**gwalters** · 04-21-2005

ping -b <a>.[b].<c>.255

**serz** · 04-21-2005

Originally Posted by sdousley

well, i dont have the ip of all the computers on the network, but it doesn't show the ones that i do have in that file :s

How are you running the command and how does your /etc/hosts file look like?

nmap will "ping scan" what you tell it, if in the scan there's an ip that matches with an ip in /etc/hosts then it will show its hostname near its ip.

Do I explain myself?

**Fallen Angel** · 04-22-2005

Nmap is probably the best way to do this. I tried that myself.

**sdousley** · 04-22-2005

my /etc/hosts:

Code:

127.0.0.1       localhost
192.168.2.9     homer
192.168.0.1     jebediah

and when i run nmap -sP 192.168.0.0/24 i get:

Code:

homer root # nmap -sP 192.168.0.0/24

Starting nmap 3.75 &#40; http&#58;//www.insecure.org/nmap/ &#41; at 2005-04-22 13&#58;34 BST
Host jebediah &#40;192.168.0.1&#41; appears to be up.
MAC Address&#58; 00&#58;01&#58;02&#58;0C&#58;CF&#58;02 &#40;3com&#41;
Host 192.168.0.4 appears to be up.
MAC Address&#58; 00&#58;40&#58;D0&#58;47&#58;9E&#58;FA &#40;Mitac International&#41;
Host 192.168.0.9 appears to be up.
Nmap run completed -- 256 IP addresses &#40;3 hosts up&#41; scanned in 5.753 seconds
homer root #

See it doesn't show the ip for homer? (the computer i'm running it from)

**serz** · 04-22-2005

In your /etc/hosts file, It's 192.168.0.9, not 192.168.2.9.

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