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Audience: System Admins - Experts
Last Updated: 5/4/2005 5:23:29 PM
Original Creation Date: 5/4/2005 5:23:29 PM
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Subnet Cheat Sheet
By Erik Rodriguez
The tables below are commonly used subnet masks and hosts.
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Class C
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| Mask
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Notation | Subnets | Hosts | | 255.255.255.0 | /24 | 1 | 256 | | 255.255.255.128 | /25 | 2 | 128 | | 255.255.255.192 | /26 | 4 | 64 | | 255.255.255.224 | /27 | 8 | 32 | | 255.255.255.240 | /28 | 16 | 16 | | 255.255.255.248 | /29 | 32 | 8 | | 255.255.255.252 | /30 | 64 | 4 | | 255.255.255.254 | /31 | 128 | 2 | | 255.255.255.255 | /32 | 256 | 1 | |
Class B | | | Mask | Notation | Subnets | Hosts | | 255.255.0.0 | /16 | 2 | 65,536 | | 255.255.128.0 | /17 | 2 | 32,768 | | 255.255.192.0 | /18 | 4 | 16,384 | | 255.255.224.0 | /19 | 8 | 8,192 | | 255.255.240.0 | /20 | 16 | 4,096 | | 255.255.248.0 | /21 | 32 | 2,048 | | 255.255.252.0 | /22 | 64 | 1,024 | | 255.255.254.0 | /23 | 128 | 512 | | 255.255.255.0 | /24 | 256 | 256 | | Class A | | | Mask | Notation | Subnets | Hosts | | 255.0.0.0 | /8 | 1 | 16,777,216 | | 255.128.0.0 | /9 | 2 | 8,388,608 | | 255.192.0.0 | /10 | 4 | 4,194,304 | | 255.224.0.0 | /11 | 8 | 2,097,152 | | 255.240.0.0 | /12 | 16 | 1,048,576 | | 255.248.0.0 | /13 | 32 | 524,288 | | 255.252.0.0 | /14 | 64 | 262,144 | | 255.254.0.0 | /15 | 128 | 131,072 | | 255.255.0.0 | /16 | 256 | 65,536 | | | | |
