Published on April 3rd, 2014
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 | 80.0.0.0 to 80.81.0.255 |
x.y.z.0/16 | 65,536 | 1 B = 256 C | 80.0.0.0 to 80.0.255.255 |
x.y.z.0/8 | 16,777,216 | 1 A = 256 B | 80.0.0.0 to 80.255.255.25 |