RFC1918 Private IPv4 Address Spaces

RFC1918 name IP address range number of addresses largest CIDR block (subnet mask) host id size mask bits classful description
24-bit block 10.0.0.0 – 10.255.255.255 16,777,216 10.0.0.0/8 (255.0.0.0) 24 bits 8 bits single class A network
20-bit block 172.16.0.0 – 172.31.255.255 1,048,576 172.16.0.0/12 (255.240.0.0) 20 bits 12 bits 16 contiguous class B networks
16-bit block 192.168.0.0 – 192.168.255.255 65,536 192.168.0.0/16 (255.255.0.0) 16 bits 16 bits 256 contiguous class C networks
More Stories
Palo Alto RMA Replacement