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IPv4 Subnets Cheat Sheet

Nghia Phan
Nghia Phan
Update:
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Language: Vi
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Subnets

CIDRSUBNET MASKNUMBER OF ADDRESSESWILDCARD
/32255.255.255.25510.0.0.0
/31255.255.255.25420.0.0.1
/30255.255.255.25240.0.0.3
/29255.255.255.24880.0.0.7
/28255.255.255.240160.0.0.15
/27255.255.255.224320.0.0.31
/26255.255.255.192640.0.0.63
/25255.255.255.1281280.0.0.127
/24255.255.255.02560.0.0.255
/23255.255.254.05120.0.1.255
/22255.255.252.01,0240.0.3.255
/21255.255.248.02,0480.0.7.255
/20255.255.240.04,0960.0.15.255
/19255.255.224.08,1920.0.31.255
/18255.255.192.016,3840.0.63.255
/17255.255.128.032,7680.0.127.255
/16255.255.0.065,5360.0.255.255
/15255.254.0.0131,0720.1.255.255
/14255.252.0.0262,1440.3.255.255
/13255.248.0.0524,2880.7.255.255
/12255.240.0.01,048,5760.15.255.255
/11255.224.0.02,097,1520.31.255.255
/10255.192.0.04,194,3040.63.255.255
/9255.128.0.08,388,6080.127.255.255
/8255.0.0.016,777,2160.255.255.255
/7254.0.0.033,554,4321.255.255.255
/6252.0.0.067,108,8643.255.255.255
/5248.0.0.0134,217,7287.255.255.255
/4240.0.0.0268,435,45615.255.255.255
/3224.0.0.0536,870,91231.255.255.255
/2192.0.0.01,073,741,82463.255.255.255
/1128.0.0.02,147,483,648127.255.255.255
/00.0.0.04,294,967,296255.255.255.255

IP address classes

ClassAddress range
A0.0.0.0 – 127.255.255.255
B128.0.0.0 – 191.255.255.255
C192.0.0.0 – 223.255.255.255
D224.0.0.0 – 239.255.255.255
E240.0.0.0 – 255.255.255.255

Private address ranges

Range typeAddress range
Class A private10.0.0.0 – 10.255.255.255
Class B private172.16.0.0 – 172.31.255.255
Class C private192.168.0.0 – 192.168.255.255
Localhost127.0.0.0 – 127.255.255.255
Zeroconf (APIPA/Bonjour)169.254.0.0 – 169.254.255.255
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