What are the RFC1918 address ranges?

Private Address Range (ipv4)

10.0.0.0 - 10.255.255.255 (10/8 prefix)
172.16.0.0 - 172.31.255.255 (172.16/12 prefix) (/12=255.240.0.0)
192.168.0.0 - 192.168.255.255 (192.168/16 prefix)