6connect on Twitter: "Our IPv6 Subnet Calculator can be used to work within your IP block range and estimate the structure of your IPv6 allocation. Or you can just generate CSV files
Site24x7 Subnet Calculator for IPv4 and IPv6: Network IP Calculations Made Simple - Site24x7 Blog
IP Calculator / IP Workshop Professional
Gip – IP calculator for GNOME desktop environment | Debian Admin
VLSM / CIDR Subnet Calculator - Apps on Google Play
IP Calculator / IP Workshop Professional
Subnet Calculator
IP Subnet Calculator – Subnet Mask Calculator | SolarWinds