An Internet Protocol address manager creates data containers for managing Internet Protocol addresses. Each data container can store one or more address blocks of Internet Protocol addresses and includes a container policy for managing the address blocks. Additionally, the Internet Protocol address manager creates links between the data containers to organize the data containers into a container hierarchy. The Internet Protocol address manager can then allocate the address blocks or portions thereof among the data containers in the container hierarchy according to the container policies. Moreover, each data container can be associated with a network or subnet of a computer network. Further, the Internet Protocol address manager can allocate or assign multiple Internet Protocol addresses of multiple Internet Protocol versions to subnets or hosts in the computer network.