Subnet table for IPv4 cheat sheet

Subnet range – Class A

Type Hosts Netmask HEX
/1 2048 M 128.0.0.0 80.00.0­0.00
/2 1024 M 192.0.0.0 C0.00.0­0.00
/3 512 M 224.0.0.0 E0.00.0­0.00
/4 256 M 240.0.0.0 F0.00.0­0.00
/5 128 M 248.0.0.0 F8.00.0­0.00
/6 64 M 252.0.0.0 FC.00.0­0.00
/7 32 M 254.0.0.0 FE.00.0­0.00
/8 16 M 255.0.0.0 FF.00.0­0.00

Subnet range – Class B

Type Hosts Netmask HEX
/9 8 M 255.12­8.0.0 FF.80.0­0.00
/10 4 M 255.19­2.0.0 FF.C0.0­0.00
/11 2 M 255.22­4.0.0 FF.E0.0­0.00
/12 1024 K 255.24­0.0.0 FF.F0.0­0.00
/13 512 K 255.24­8.0.0 FF.F8.0­0.00
/14 256 K 255.25­2.0.0 FF.FC.0­0.00
/15 128 K 255.25­4.0.0 FF.FE.0­0.00
/16 64 K 255.25­5.0.0 FF.FF.0­0.00

Subnet range – Class C

Type Hosts Netmask HEX
/17 32 K 255.25­5.128.0 FF.FF.8­0.00
/18 16 K 255.25­5.192.0 FF.FF.C­0.00
/19 8 K 255.25­5.224.0 FF.FF.E­0.00
/20 4 K 255.25­5.240.0 FF.FF.F­0.00
/21 2 K 255.25­5.248.0 FF.FF.F­8.00
/22 1 K 255.25­5.252.0 FF.FF.F­C.00
/23 512 255.25­5.254.0 FF.FF.F­E.00
/24 256 255.25­5.255.0 FF.FF.F­F.00

Type Hosts Usable hosts Netmask
/25 128 126 255.255.255.128
/26 64 62 255.255.255.192
/27 32 30 255.255.255.224
/28 16 14 255.255.255.240
/29 8 6 255.255.255.248
/30 4 2 255.255.255.252
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© 2018 David Stein