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Subnet Calculator

Subnet Calculator
Network Class
First Octet Range
IP Address
. . .
Hex IP Address
Subnet Mask
Wildcard Mask
Subnet Bits
Mask Bits
Maximum Subnets
Hosts per Subnet
Host Address Range
Subnet ID
Broadcast Address
Subnet Bitmap

Note: This tool is a reworked version of the one found here. I’ve contacted them for permission to port their work, but I have yet to hear back from them. This version is written entirely in javascript and is free to be reused anywhere.