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nmap

Suppose you want to find a ssh server on your local subnet, here is the command to do so:

nmap -p 22 --open 192.168.1.0/24

Starting Nmap 6.40 ( http://nmap.org ) at 2014-10-28 11:18 CET
Nmap scan report for XXX.XXX.XXX.1
Host is up (0.0016s latency).
PORT   STATE SERVICE
22/tcp open  ssh

Nmap scan report for XXX.XXX.XXX.42
Host is up (0.00081s latency).
PORT   STATE SERVICE
22/tcp open  ssh

Nmap scan report for XXX.XXX.XXX.97
Host is up (0.00057s latency).
PORT   STATE SERVICE
22/tcp open  ssh

Nmap scan report for XXX.XXX.XXX.103
Host is up (0.00044s latency).
PORT   STATE SERVICE
22/tcp open  ssh

Nmap scan report for XXX.XXX.XXX.132
Host is up (0.00037s latency).
PORT   STATE SERVICE
22/tcp open  ssh

Nmap scan report for XXX.XXX.XXX.138
Host is up (0.00029s latency).
PORT   STATE SERVICE
22/tcp open  ssh

Nmap scan report for XXX.XXX.XXX.233
Host is up (0.00011s latency).
PORT   STATE SERVICE
22/tcp open  ssh

• install nmap using sudo apt-get install nmap
• Replace 192.168.1.0/24 by your local network address, see ifconfig
• Finding a machine on the network : arp-scan