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) 192.168.1.0 192.168.1.255 (192.168.1/24 prefix)