Private IPv4 Address Spaces

RFC1918 name IP address range Number of addresses
24-bit block 10.0.0.0 – 10.255.255.255 16,777,216
20-bit block 172.16.0.0 – 172.31.255.255 1,048,576
16-bit block 192.168.0.0 – 192.168.255.255 65,536