RFC 1918 Address Blocks
RFC 1918 defines three private IP address blocks for local use. These addresses must not be used within the Internet. Internet boundary routers should filter any routing updates containing such addresses. Therefore, RFC 1918 addresses are safer for local use than official ("global") addresses. In addition, invalid routes may occur in the Internet routing tables because global addresses are not filtered.
The RFC 1918 address blocks are:
■ 172.16.0.0 - 172.31.255.255 (prefix 172.16/12)
■ 192.168.0.0 - 192.168.255.255 (prefix 192.168/16)
Continue reading here: Calculation of Authentication Header AH hash includes the whole IP header
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