Question: what are the rfc1918 address ranges?
Answer: 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)