http://en.wikipedia.org/wiki/Private_network
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Dedicated space for Carrier Grade NAT deployments[edit]
In April 2012, IANA allocated 100.64.0.0/10 for use in carrier grade NAT scenarios in RFC 6598.[3] This address block should not be used either on private networks or on the public Internet: it is intended only for use within the internal operations of carrier networks. The size of the address block (
, approximately 4 million, addresses) was selected to be large enough to uniquely number all customer access devices for all of a single operator's points of presence in a large metropolitan area such as the Tokyo metropolitan area.[3]
quote here
Dedicated space for Carrier Grade NAT deployments[edit]
In April 2012, IANA allocated 100.64.0.0/10 for use in carrier grade NAT scenarios in RFC 6598.[3] This address block should not be used either on private networks or on the public Internet: it is intended only for use within the internal operations of carrier networks. The size of the address block (
, approximately 4 million, addresses) was selected to be large enough to uniquely number all customer access devices for all of a single operator's points of presence in a large metropolitan area such as the Tokyo metropolitan area.[3]
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