Provided are a method, system, and computer storage device for managing zone information for devices in a network. A zone group table includes entries for different pairs of zones, wherein each entry indicates whether access between a pair of the zones is permitted. An attribute zone table indicates whether devices in the zones are initiator, target and/or initiator/target. For a selected zone, indication is made of whether ports in the devices in the selected zone have an initiator, target and/or initiator/target attribute as indicated in the attribute zone table. A determination is made as to whether all the ports in the devices in the selected zone have the same attribute of initiator, target or initiator/target. If so, a division proposal is indicated for the selected zone proposing to separate devices in the selected zone into at least one new zone.