PHP Subnet Calculator is pretty simple. 

To install, just move SubnetCalc.php into the webroot of a 
php capable webserver.

v1.1 Released 6/28/03 
  Should work well.  I think I fixed all the bugs.
v1.2 Released 6/28/03
  Works the same, but the code is cleaner and more efficient.

Suggestions, Bug reports, Question etc.
  Contact Ray Ferguson, foo@share-foo.com.

Online Demo:
  http://share-foo.com/SubnetCalc.php

