How to perform IP address management and how to perform subnetting, i have a good idea

[Hans]

>I found a good network management software -IPMaster, recommend it to
> you. You can download this software at http://www.softsession.com
>
> IPMaster is a IP address management software. It provides visual IP
> address assignment(network topology tree), automatic subnet calculator,
> mask calculation, subnetting, network segment scanning, host
> monitoring, ping, traceroute, telnet, and netsend  etc. It supports
> VLSM( Variable Length Subnet Masks) and CIDR( Classless Inter-Domain
> Routing). The purpose of this software is to assign and manage IP
> address efficiently for enterprise network.

Me and my college did have an look at this tool and marked it useless.

Useless since it has an hard restriction that an subnet can not be larger 
then

an /23.