Bitcricket

Bitcricket offers hands-on network analysis training, on-site troubleshooting, consulting services, and performance monitoring software. Specialties include TCP/IP application performance analysis, VoIP troubleshooting, network forensics, and 802.11 wireless LANs (WLAN).

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IP Subnet Calculator for IPv4 and IPv6
Free
Powerful IPv4 and IPv6 Network Calculator
Windows
IP Subnet Calculator for IPv4/v6
Free
Bitcricket Subnet Calculator: Modern Rewrite of a Classic
Windows
IP Subnet Calculator for IPv4 and IPv6
Free
Compute IPv4 subnet masks and subnet address ranges.
Mac