Subnet Range - Class A

Type Hosts Netm­ask Hex Value
/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 Host Netm­ask Hex Value
/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 Value
/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
/25 128 255.25­5.2­55.128 FF.FF.F­F.80
/26 64 255.25­5.2­55.192 FF.FF.F­F.C0
/27 32 255.25­5.2­55.224 FF.FF.F­F.E0
/28 16 255.25­5.2­55.240 FF.FF.F­F.F0
/29 8 255.25­5.2­55.248 FF.FF.F­F.F8
/30 4 255.25­5.2­55.252 FF.FF.F­F.FC
/31 2 255.25­5.2­55.254 FF.FF.F­F.FE
/32 1 255.25­5.2­55.255 FF.FF.F­F.FF
 

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Comments

DaveChild DaveChild, 08:07 18 Jan 12

Very handy, thanks. I'm always forgetting these when working with IPTables :)

Pete Pete, 13:35 13 Feb 14

Nice format. I would suggest as a possible addition the list of the RFC 1918 addresses in there too (10,x.x.x, 192.168.x.x, etc) because i always forget the other non-routable IP addresses I can use in a lab environment, and EVERYbody uses 10.x.x.x on their intranets.

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