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Network - Network IP / Subnet Calculator

Network IP / Subnet Calculator - screenshot thumbnail Network IP / Subnet Calculator - screenshot thumbnail Network IP / Subnet Calculator - screenshot thumbnail 
An application for calculating IPv4 addresses.
I will be very appreciated if you can spend your valuable time to give this app a good rate.
Feature Overview
✔ Classless Inter-Domain Routing (CIDR)
- Compute Maximum number of Subnets and Hosts; CIDR Network, Address Range
✔ Classful
- Compute base on class range.
- Compute maximum number of Subnets and Hosts; Subnet ID, Broadcast, ...
✔ IP Conversion, from
- Dotted decimal IP address
- Decimal value
- Dotted hexadecimal IP address
- Dotted binary IP address
✔ Supernet (supernetwork)
- Up to 15 entries
✔ Real time updating of output as you change values or move the slider to change the mask bit.

http://www.facebook.com/pages/IP-Calculator/401055216682560

[update 2020.11.17 ]

Usually I utilize this web site everytime I have some doubts about network subnetting: