IPv4 CIDR Chart

CIDR stands for Classless Inter-Domain Routing and is a method for allocating IP addresses as well as for IP routing.

It was introduced in 1993 by the Internet Engineering Task Force to replace the previous classful network addressing architecture on the internet.

When choosing a CIDR range for your network, the following chart will show you how many maximum IP’s you can have on that network.

For example, /32 will give you 1 usable IP, /24 will give you 256 usable IPs, while /3 will give you 512 million usable IPs.

IP AddressesBitsPrefixSubnet Mask
10/32255.255.255.255
21/31255.255.255.254
42/30255.255.255.252
83/29255.255.255.248
164/28255.255.255.240
325/27255.255.255.224
646/26255.255.255.192
1287/25255.255.255.128
2568/24255.255.255.0
5129/23255.255.254.0
1 K10/22255.255.252.0
2 K11/21255255.248.0
4 K12/20255.255.240.0
8 K13/19255.255.224.0
16 K14/18255.255.192.0
32 K15/17255.255.128.0
64 K16/16255.255.0.0
128 K17/15255.254.0.0
256 K18/14255.252.0.0
512 K19/13255.248.0.0
1 M20/12255.240.0.0
2 M21/11255.224.0.0
4 M22/10255.192.0.0
8 M23/9255.128.0.0
16 M24/8255.0.0.0
32M25/7254.0.0.0
64 M26/6252.0.0.0
128 M27/5248.0.0.0
256 M28/4240.0.0.0
512 M29/3224.0.0.0
1024 M30/2192.0.0.0
2048 M31/1128.0.0.0
4096 M32/00.0.0.0

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