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This memo describes the dynamic allocation of shared IPv4 addresses to clients using DHCPv4. Address sharing allows a single IPv4 address to be allocated to multiple active clients simultaneously, with each client being differentiated by a unique set of transportlayer source port numbers. The necessary changes to existing DHCPv4 client and server behavior are described, and a new DHCPv4 option for provisioning clients with shared IPv4 addresses is included.