IP address management tool

[Gunnar Flygt]

Is there anyone out there, knowing of a good tool for managing IP
addresses? I want a tool where it is easy to get a picture of how a
class B network is divided in to subnets of different sizes, where the
dhcp ranges are and what statically addresses there are. 

Has anyone produced such a tool? database - php -web server based.

-- 
Gunnar Flygt
SR Datadrift
Sveriges Radio