IP Subnet Mask Calculator
Class A B C
Network IP
Subnet Mask
Wildcard Mask
Mask Bits
Hosts
Subnet ID
Start
End
Broadcast
Bitmap

IPv4 Subnet Calculator

This calculator returns a variety of information regarding Internet Protocol version 4 (IPv4) subnets including possible network addresses, usable host ranges, subnet mask, and IP class, among others.

This is going to be your “go to tool” when planning for a large network setup.