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Guide to Subnet Mask (Subnetting) & IP Subnet Calculator
IP Calculator / IP Subnetting
Given the IP address 192.168.1.0/28, what is the subnet mask of network? What is the network address? What are the first and the last valid IP addresses? - Quora
Subnet Calculator Sites for Network Admins
IP Calculater Web Tools [cmdref.net - Cheat Sheet and Example]
Supernetting Tutorial: - Supernetting Explained with Examples