phpipam is an open-source web IP address management application.
Its goal is to provide light and simple IP address management
application. It is ajax-based using jQuery libraries, it uses php
scripts and javascript and some HTML5/CSS3 features, so some modern
browser is preferred to be able to display javascript quickly and
correctly...

Features and tools:
- Section / Subnet separation
- Subnet nesting;
- IPv4/IPv6 support
- Displays free range and number of clients
- Subnet statistics
- User management
- E-Mail notification with IP details
- Import IP addresses from XLS / CSV file
- Export IP database to XLS file
- IPv4/IPv6 calculator
- Search IP database
- IP request module
- Custom IP address fields

WWW: http://phpipam.net/