Guide to Subnet Mask (Subnetting) & IP Subnet Calculator
CIDR Subnet Mask Cheat Sheet | NetworkProGuide
The Sky Networks - CIDR CIDR (Classless Inter-Domain Routing) notation rather than the common subnet mask 255.x.x.x when configuring addresses and networks. Refer to the CIDR Subnet Table to find the CIDR
Subnetting Cheat Sheet | Download | Use Online ⋆ IpCisco
The TCP/IP Guide - IP Default Subnet Masks For Address Classes A, B and C
The TCP/IP Guide - IP Subnetting Step #3: Determining The Custom Subnet Mask