IPplan is a free (GPL), web based, multilingual, IP address management and
tracking tool written in php4, simplifying the administration of your IP
address space. IPplan goes beyond IP address management including DNS
administration, configuration file management, circuit management and
storing of hardware information. IPplan can handle a single network or
cater for multiple networks and customers with overlapping address space.

WWW: http://iptrack.sourceforge.net/
