|
|
|
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:
172.200.0.0/16
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 |
| /27 |
1/8th of a Class C |
32 hosts |
| /26 |
1/4th of a Class C |
64 hosts |
| /25 |
1/2 of a Class C |
128 hosts |
| /24 |
1 Class C |
256 hosts |
| /23 |
2 Class C |
512 hosts |
| /22 |
4 Class C |
1,024 hosts |
| /21 |
8 Class C |
2,048 hosts |
/20
|
16 Class C
|
4,096 hosts
|
/19
|
32 Class C
|
8,192 hosts
|
/18
|
64 Class C
|
16,384 hosts
|
/17
|
128 Class C
|
32,768 hosts
|
/16
|
256 Class C (= 1 Class B)
|
65,536 hosts
|
/15
|
512 Class C
|
131,072 hosts
|
/14
|
1,024 Class C
|
262,144 hosts
|
| /13 |
2,048 Class C |
524,288 hosts |
 F.A.Q.
 Perfect City Icons
Perfect Network Icons
Navigation Toolbar Icons
Security Toolbar Icons
Database Toolbar Icons
|
|
Copyright © 2005-2022 ArmCode. All rights reserved.
|
|
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.
Transport Icon Set is a professional collection that includes transport and traffic themed icons, available in the following formats: 16x16, 24x24, 32x32, 48x48 and 256x256. Available file formats are ICO, PNG, GIF, and BMP.
E-Mail Icon Set is a collection of wonderfully-crafted stock icons for use in commercial and personal products, including software applications, websites, blogs and presentations. The icons have a bright color palette, smooth and well-rounded edges.
Vista Toolbar Icons. A collection of practical and eye catching icons representing all basic operations required for surfing the internet or using various applications.
Hardware Icon Set is a collection of icons containing pictures of various hardware items. The collection includes both 256-color icons (for all Windows versions) and full-color icons for Windows XP and Vista.
|
|
|
|
Ready Icons