Scan for Computers on Local Network with Nmap

1 min read
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With my Raspberry Pi project, it has been using DHCP to get an IP address, and my network keeps assigning a different value (I know there are solutions to this but I haven't made use of them yet). So, I went ahead and installed nmap using the homebrew package manager for OS X:

$ brew install nmap

And now, I can scan the local network to see what devices are up:

$ sudo nmap -sP 192.168.1.1-254

Starting Nmap 6.00 ( http://nmap.org ) at 2012-06-10 10:12 EDT
Nmap scan report for 192.168.1.1
Host is up (0.0041s latency).
MAC Address: B8:8D:12:5A:00:00 (Apple)
Nmap scan report for 192.168.1.2
Host is up (0.0039s latency).
MAC Address: E8:E0:B7:17:00:00 (Toshiba)
Nmap scan report for 192.168.1.6
Host is up (0.32s latency).
MAC Address: B8:27:EB:4C:00:00 (Raspberry Pi Foundation)
Nmap done: 254 IP addresses (3 hosts up) scanned in 5.46 second

The better solution would be to have the device use a static IP address (or even cooler, add a tiny LCD screen to show the current IP address :D).

Thomas Hunter II Avatar

Thomas Hunter II is a Software Engineer with 18+ years building scalable, production-grade systems. Deep expertise in Node.js, observability, and developer tooling, with a strong track record of driving architectural decisions, mentoring engineers, and improving customer facing technical documentation. Author of 5 books (including O'Reilly), certified by the OpenJS Foundation, and frequent international conference speaker.