What is CIDR and IP Prefix?

CIDR (Classless Inter-Domain Routing) is a method for allocating and representing IP addresses and their associated routing. CIDR uses the format:

• IP_address/prefix_length, where:
• IP_address is the starting address of the range.
• prefix_length is the prefix, which specifies the number of bits used for the network portion of the address.

The prefix represents the number of leading 1 bits in the IP Block mask. It determines the width (in bits) of the IP Block.