Get IP addresses of network devices

Question

How do I get the IP address of all the devices on my local network? I am using Mac OS X Snow Leopard.

Answer 1

Using nmap, you can see machines that are alive and it will return both hostnames (if found) and IP addresses:

For example, if your network is 192.168.1.X, use:

nmap -sP 192.168.1.0/24

or if it's 192.168.0.X:

nmap -sP 192.168.0.0/24

Example output:

Host somedummyhost (192.168.1.22) is up (0.0040s latency).
Host atinylaptop (192.168.1.32) is up (0.013s latency).
Host 192.168.1.44 is up (0.00019s latency).
Host 192.168.1.58 is up (0.020s latency).
Host 192.168.1.70 is up (0.018s latency).
Nmap done: 256 IP addresses (5 hosts up) scanned in 11.63 seconds

Answer 2

Why bother downloading and installing nmap? If you are on a 192.168.1.xxx home network just ping 192.168.1.255 and look at the replies. All the devices on your subnet that can respond to the ping will. you can arp -a for additional info.

Answer 3

You could (and this is what I would do) run a nmap scan on the local ip address range (e.g. 192.168.XXX.0-255) and see what responds.