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
Free Class C Subnetting Tutorial, What is CIDR, Subnet Mask, Directed and Limited Broadcast
Subnets – Learning IT
255.255.255.128 Archives » NetworkUstad
If we don't subnet and use as our subnet mask then we use all of our IP addresses on one network. This is not an efficient use of our Class. - ppt