Abstract: A network device to monitor and control allotment of internet protocol (IP) version six (IPv6) addresses within a computer network is provided. The network device may cause client devices to fail to obtain an IPv6 address based on network device actions. For example, the network device may: obtain a network packet from an IP network; determine if the network packet is a duplicate address determination (DAD) packet; identify a network client device originating the DAD packet; compare a number of IPv6 addresses already assigned to the network client device to a threshold allotment of addresses; based on a determination that the network client device would exceed the threshold allotment, transmit an address in use message on the IP network; and based on a determination that the network client device has an available address within the threshold allotment, ignore the DAD packet.