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Who has to renumber with CIDR ?

April 26, 2017cidr renumber

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Who has to renumber with CIDR ?

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Sites that move from one ISP to another, and who had been allocated addresses from their original ISP’s CIDR block, in all likelihood will have to return those addresses as part of the move. The reason is to keep the number of prefixes in the global routing system within the limits of current technology. For further hints and procedures for renumbering, see the PIER (Procedures for Internet/Enterprise Renumbering) homepage.