a contiguous block of Internet Protocol Version 4 Numbers, commonly expressed as a Classless Inter-Domain Routing notation, e.g., A.B.C.D/X, where A, B, C and D are numbers between 0 and 255 (inclusive) and X is a number between 0 and 32 (inclusive).
|CIDR Notation||Number of Hosts||Number of Classes||Example Range|
|x.y.z.0/24||256||1 C||126.96.36.199 to 188.8.131.52|
|x.y.z.0/16||65,536||1 B = 256 C||184.108.40.206 to 220.127.116.11|
|x.y.z.0/8||16,777,216||1 A = 256 B||18.104.22.168 to 22.214.171.124|