What is CIDR?
Classless inter-domain routing: writing a network as an address plus a prefix length, as in 192.168.1.0/24.
It replaced the fixed class A/B/C boundaries in 1993 and allows a subnet of any power-of-two size.
It replaced the fixed class A/B/C boundaries in 1993 and allows a subnet of any power-of-two size.