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robert-claypool/private-ip-address-space.md

Created August 30, 2018 03:57
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private-ip-address-space.md

The Internet Assigned Numbers Authority (IANA) has reserved the following three blocks of the IP address space for private internets:

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)

We will refer to the first block as "24-bit block", the second as "20-bit block", and to the third as "16-bit" block. Note that (in pre-CIDR notation) the first block is nothing but a single class A network number, while the second block is a set of 16 contiguous class B network numbers, and third block is a set of 256 contiguous class C network numbers.

-- Address Allocation for Private Internet, RFC 1918

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