Created
April 29, 2019 14:46
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CIDR cheat sheet
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| Netmask Netmask (binary) CIDR Notes | |
| _____________________________________________________________________________ | |
| 255.255.255.255 11111111.11111111.11111111.11111111 /32 Host (single addr) | |
| 255.255.255.254 11111111.11111111.11111111.11111110 /31 Unuseable | |
| 255.255.255.252 11111111.11111111.11111111.11111100 /30 2 useable | |
| 255.255.255.248 11111111.11111111.11111111.11111000 /29 6 useable | |
| 255.255.255.240 11111111.11111111.11111111.11110000 /28 14 useable | |
| 255.255.255.224 11111111.11111111.11111111.11100000 /27 30 useable | |
| 255.255.255.192 11111111.11111111.11111111.11000000 /26 62 useable | |
| 255.255.255.128 11111111.11111111.11111111.10000000 /25 126 useable | |
| 255.255.255.0 11111111.11111111.11111111.00000000 /24 "Class C" 254 useable | |
| 255.255.254.0 11111111.11111111.11111110.00000000 /23 2 Class C's | |
| 255.255.252.0 11111111.11111111.11111100.00000000 /22 4 Class C's | |
| 255.255.248.0 11111111.11111111.11111000.00000000 /21 8 Class C's | |
| 255.255.240.0 11111111.11111111.11110000.00000000 /20 16 Class C's | |
| 255.255.224.0 11111111.11111111.11100000.00000000 /19 32 Class C's | |
| 255.255.192.0 11111111.11111111.11000000.00000000 /18 64 Class C's | |
| 255.255.128.0 11111111.11111111.10000000.00000000 /17 128 Class C's | |
| 255.255.0.0 11111111.11111111.00000000.00000000 /16 "Class B" | |
| 255.254.0.0 11111111.11111110.00000000.00000000 /15 2 Class B's | |
| 255.252.0.0 11111111.11111100.00000000.00000000 /14 4 Class B's | |
| 255.248.0.0 11111111.11111000.00000000.00000000 /13 8 Class B's | |
| 255.240.0.0 11111111.11110000.00000000.00000000 /12 16 Class B's | |
| 255.224.0.0 11111111.11100000.00000000.00000000 /11 32 Class B's | |
| 255.192.0.0 11111111.11000000.00000000.00000000 /10 64 Class B's | |
| 255.128.0.0 11111111.10000000.00000000.00000000 /9 128 Class B's | |
| 255.0.0.0 11111111.00000000.00000000.00000000 /8 "Class A" | |
| 254.0.0.0 11111110.00000000.00000000.00000000 /7 | |
| 252.0.0.0 11111100.00000000.00000000.00000000 /6 | |
| 248.0.0.0 11111000.00000000.00000000.00000000 /5 | |
| 240.0.0.0 11110000.00000000.00000000.00000000 /4 | |
| 224.0.0.0 11100000.00000000.00000000.00000000 /3 | |
| 192.0.0.0 11000000.00000000.00000000.00000000 /2 | |
| 128.0.0.0 10000000.00000000.00000000.00000000 /1 | |
| 0.0.0.0 00000000.00000000.00000000.00000000 /0 IP space |
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