For when your laptop is on the other side of the room and you want to know its ip address.
Windows only, wraps SendArp()
C:\>arpscan.exe
Interface List Address Status Scan Action
=======================================================================================================================
Local Area Connection 192.168.1.2 Up Scan
Loopback Pseudo-Interface 1 ::1 Up Skip
Loopback Pseudo-Interface 1 127.0.0.1 Up Skip
isatap.{e93582d2-c744-487f-a0b3-ea0dd44d3f58} fe80::5efe:192.168.1.2%13 Down Skip
=======================================================================================================================
Interface . . . . . . : 192.168.1.2/255.255.255.0
Network Address . . . : 192.168.1.0
Broadcast Address . . : 192.168.1.255
Usable address range . : 192.168.1.1 - 192.168.1.254
Size . . . . . . . . . : 255 addresses
Scanning:
192.168.1.1 [4B-37-6E-9A-A7-1D]
192.168.1.255 [FC-9E-39-05-4F-01]
192.168.1.117 [AC-D1-B7-83-12-E9]
192.168.1.2 [B5-9E-71-39-8F-51]
Scanning 213/255 ...