Network Classless Inter Domain Routing (CIDR) Cheat Sheet

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Internet and most of the network infrastructures uses IP Protocol. IP protocol uses IP addresses in order to connect different hosts and networks over globe. Classless Inter Domain Routing or CIDR is hierarchical IP addressing scheme used to set IP addresses to the hosts and network. Here we will learn how to calculate IP address, Network Address, Broadcast Address, Network Mask and provide these as cheat sheet.

IP address, Network Address, Broadcast Address, Network Mask Calculation

We will calculate given network parameters in this part we can use following cheat sheet. In this example we will use 192.168.1.0 as network address. We need 10 IP address for our host. If we look to the table we see that Potential host numbers a 2 and its multiply. So we will use 16 host line which have /28 network mask or 255.255.255.240 . So the network information will be like below.

CIDR Cheat Sheet

Here is some explanation

  • Prefix is bit count for network address
  • Amount Of a Class C is how many C class network can be created in this network
  • Potential Hosts is the count of IP numbers
  • Actual Hosts is the count of usable IP numbers because 1 IP is used for network address and 1 IP is used for broadcast purposes.
  • Netmask is decimal presentation of the prefix with IP format.
PrefixAmount Of a Class CPotential HostsActual HostsNetmask# of subnets
/311/1282255.255.255.254128
/301/6442255.255.255.25264
/291/3286255.255.255.24832
/281/161614255.255.255.24016
/271/83230255.255.255.2248
/261/46462255.255.255.1924
/251/2128126255.255.255.1282
/241256254255.255.255.01
/232512510255.255.254.0128
/2241,0241,022255.255.252.064
/2182,0482,046255.255.248.032
/20164,0964,094255.255.240.016
/19328,1928,190255.255.224.08
/186416,38416,382255.255.192.04
/1712832,76832,766255.255.128.02
/16256 = 1 class B net65,53665,534255.255.0.01
/15512 = 2 B nets131,072131,070255.254.0.0128
/141,024 = 4 B nets262,144262,142255.252.0.064
/132,048 = 8 B nets524,288524,286255.248.0.032
/124,096 = 16 B nets1,048,5761,048,574255.240.0.016
/118,192 = 32 B nets2,097,1522,097,150255.224.0.08
/1016,384 = 64 B nets4,194,3044,194,302255.192.0.04
/932,768 = 128 B nets8,388,6088,388,606255.128.0.02
/865,536 = 256 B nets = 1 A net16,777,21616,777,214255.0.0.01
/7131,072 = 2 A nets33,554,43233,554,430254.0.0.0128
/6262,144 = 4 A nets67,108,86467,108,862252.0.0.064
/5524,888 = 8 A nets134,217,728134,217,726248.0.0.032
/41,048,576 = 16 A nets268,435,456268,435,454240.0.0.016
/32,097,152 = 32 A nets536,870,912536,870,910224.0.0.08
/24,194,304 = 64 A nets1,073,741,8241,073,741,822192.0.0.04
/18,388,608 = 128 A nets2,147,483,6482,147,483,646128.0.0.02
/016,777,216 = 256 A nets4,294,967,2964,294,967,2940.0.0.01
LEARN MORE  What is IP Address (Internet Protocol Address)?

Another CIDR Cheat Sheet

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