IPSub is a IP Subnet Calculator. The file IPSubint.exe will install IPSub.
For Win95 and WinNT 4.0, simply select Start > Run and type <path>\ipsubint. 
For WinNT 3.51, in Program Manager, select File > Run and type 
<path>\ipsubint. Where <path> is the drive and directory where IPSubint 
is located. By default the setup program will install to c:\IPSub, this can
be changed.

IPSub is Shareware and as such may be freely destributed providing a 
Registration Number is not included. For support contact me at 
dandress2@worldnet.att.net.