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Find devices on your network

I have a NAS device on my network which has a web interface, but I didn’t know it’s IP. Running this simple command from cmd.exe gave me a handful of IPs to try which lead me to finding it very quickly:

arp -a

The results should look something like this:

C:\Users\Mark>arp -a

Interface: 192.168.0.12 --- 0xa
  Internet Address      Physical Address      Type
  192.168.0.1           78-cd-8e-7a-b5-f7     dynamic
  192.168.0.15          00-01-55-31-0c-29     dynamic
  192.168.0.17          1c-4b-d6-cf-e3-2d     dynamic
  192.168.0.255         ff-ff-ff-ff-ff-ff     static
  224.0.0.2             01-00-5e-00-00-02     static
  224.0.0.22            01-00-5e-00-00-16     static
  224.0.0.252           01-00-5e-00-00-fc     static
  225.0.0.1             01-00-5e-00-00-01     static
  230.0.0.3             01-00-5e-00-00-03     static
  239.255.255.250       01-00-5e-7f-ff-fa     static
  255.255.255.255       ff-ff-ff-ff-ff-ff     static

Interface: 192.168.56.1 --- 0xf
  Internet Address      Physical Address      Type
  192.168.56.255        ff-ff-ff-ff-ff-ff     static
  224.0.0.2             01-00-5e-00-00-02     static
  224.0.0.22            01-00-5e-00-00-16     static
  224.0.0.252           01-00-5e-00-00-fc     static
  225.0.0.1             01-00-5e-00-00-01     static
  239.255.255.250       01-00-5e-7f-ff-fa     static

It was one of the dynamic IPs; I’m not sure if that’s always the case.