Private IP addresses:

10.0.0.0 - 10.255.255.255 (=10.0.0.0/8)

172.16.0.0 - 172.31.255.255 (=172.16.0.0/12)

192.168.0.0 - 192.168.255.255 (=192.168.0.0/16)

127.0.0.1 (localhost)