What Is CIDR?
CIDR is short for Classless Inter-Domain Routing.
CIDR is an IP addressing scheme that replaces the older system based on classes A, B, and C. With CIDR, a single IP address can be used to designate many unique IP addresses. A CIDR IP address looks like a normal IP address except that it ends with a slash followed by a number, called the IP network prefix. For example:
The IP network prefix specifies how many addresses are covered by the CIDR address, with lower numbers covering more addresses. An IP network prefix of /12, for example, can be used to address 1,048,576 former Class C addresses.
CIDR addresses reduce the size of routing tables and make more IP addresses available within organizations.
CIDR is also called supernetting.
|CIDR Block Prefix
||# Equivalent Class C
||# of Host |
||1/8th of a Class C
||1/4th of a Class C
||1/2 of a Class C
||1 Class C
||2 Class C
||4 Class C
||8 Class C
||16 Class C
||32 Class C
||64 Class C
||128 Class C
||256 Class C (= 1 Class B)
||512 Class C
||1,024 Class C
||2,048 Class C
Copyright © 2005-2016 SibCode. All rights reserved.
Perfect Network Icons
is a collection of distinctive icons that represents all operations and concepts related to networks. The collection is distributed as BMP, PNG, GIF and ICO files. Each icon has three states: normal, disabled, and highlighted.
Vista Network Icon Library
is a collection of network-related icons. The collection is distributed as BMP, PNG, GIF and ICO files. Each icon has 16x16, 24x24, 32x32, 48x48 and 256x256 versions, as well as variants with and without shadows.
Speed up development of communication products and services and enhance the usability and look of your new project with ready-made Perfect Telecom Icons
. This icon library includes icons of symbols and actions that are used in telecommunications.
High quality icons attract the user's eyes and make the first impression of a program thus playing a key part in building the image of any software and its developer. Have no restraints in choosing an icon of your dream with Database Software Icons
Security Icon Set
is a collection of stock icons for use in personal and commercial products, including software applications, websites and presentations. The icons have a bright color palette, smooth and well-rounded edges.