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Private IPv4 address spaces

The Internet Engineering Task Force (IETF) has directed the Internet Assigned Numbers Authority (IANA)to reserve the following IPv4 address ranges for private networks, as published in RFC 1918[1]:


































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

ref:http://en.wikipedia.org/wiki/Private_network


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