Resolve host name from IP address

I'm looking for a command line tool which gets an IP address and returns the host name, for Windows.

The command you are looking for is called nslookup, works fine for reverse lookups IFF someone has configured a reverse zone file, which they don't always do.

if all the above fails, and you are specifically looking for a Windows machine, you can use

nbtstat -a 192.168.1.50

The data returned will be all the NetBIOS records the machine has. The one with a <20h> record type will usually be the machine's name.

For many IP addresses you could just use ping -a, for example

ping -a 209.85.229.106

will return

Pinging ww-in-f106.google.com [209.85.229.106] with 32 bytes of data:

Reply from 209.85.229.106...........

If you use nslookup command with the IP address as its first argument will return the PTR record (the reverse entry) if it exists. For example:

nslookup 192.168.1.50