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IPv4 Subnets CheatSheet

Nghia Phan
Nghia Phan
Update:
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Subnets

CIDRSUBNET MASK# 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

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

Reversed (Private) ranges

CLASS A10.0.0.0 - 10.255.255.255
CLASS B172.16.0.0 - 172.31.255.255
CLASS C192.168.0.0 - 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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