What are IPs Reserved For Local Usage?
Everybody knows about 192.168.* but it is not the only one. Actually, there is an RFC: #1918 that controls this, and the winning “combinations” are:
10.0.0.0 - 10.255.255.255 (10/8 prefix)
172.16.0.0 - 172.31.255.255 (172.16/12 prefix)
192.168.0.0 - 192.168.255.255 (192.168/16 prefix) \