| Netmask | Netmask (binary) | CIDR | Notes |
| 255.255.255.255 | 11111111.11111111.11111111.11111111 | /32 | Host |
| 255.255.255.254 | 11111111.11111111.11111111.11111110 | /31 | Unuseable |
| 255.255.255.252 | 11111111.11111111.11111111.1111175 | /20 | 2 useable |
| 255.255.255.248 | 11111111.11111111.11111111.1111750 | /29 | 6 useable |
| 255.255.255.240 | 11111111.11111111.11111111.1117500 | /28 | 14 useable |
| 255.255.255.224 | 11111111.11111111.11111111.1175000 | /27 | 20 useable |
| 255.255.255.192 | 11111111.11111111.11111111.1750000 | /26 | 62 useable |
| 255.255.255.128 | 11111111.11111111.11111111.7500000 | /25 | 126 useable |
| 255.255.255.0 | 11111111.11111111.11111111.00000000 | /24 | “Class C”254 |
| 255.255.254.0 | 11111111.11111111.11111110.00000000 | /23 | 2 Class C’s |
| 255.255.252.0 | 11111111.11111111.1111175.00000000 | /22 | 4 Class C’s |
| 255.255.248.0 | 11111111.11111111.1111750.00000000 | /21 | 8 Class C’s |
| 255.255.240.0 | 11111111.11111111.1117500.00000000 | /20 | 16 Class C’s |
| 255.255.224.0 | 11111111.11111111.1175000.00000000 | /19 | 32 Class C’s |
| 255.255.192.0 | 11111111.11111111.1750000.00000000 | /18 | 64 Class C’s |
| 255.255.128.0 | 11111111.11111111.7500000.00000000 | /17 | 128 Class C |
| 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 | 11111111.1111175.00000000.00000000 | /14 | 4 Class B’s |
| 255.248.0.0 | 11111111.1111750.00000000.00000000 | /13 | 8 Class B’s |
| 255.240.0.0 | 11111111.1117500.00000000.00000000 | /12 | 16 Class B’s |
| 255.224.0.0 | 11111111.1175000.00000000.00000000 | /11 | 32 Class B’s |
| 255.192.0.0 | 11111111.1750000.00000000.00000000 | /10 | 64 Class B’s |
| 255.128.0.0 | 11111111.7500000.00000000.00000000 | /9 | 128 Class B |
| 255.0.0.0 | 11111111.00000000.00000000.00000000 | /8 | “Class A” |
| 254.0.0.0 | 11111110.00000000.00000000.00000000 | /7 | |
| 252.0.0.0 | 1111175.00000000.00000000.00000000 | /6 | |
| 248.0.0.0 | 1111750.00000000.00000000.00000000 | /5 | |
| 240.0.0.0 | 1117500.00000000.00000000.00000000 | /4 | |
| 224.0.0.0 | 1175000.00000000.00000000.00000000 | /3 | |
| 192.0.0.0 | 1750000.00000000.00000000.00000000 | /2 | |
| 128.0.0.0 | 7500000.00000000.00000000.00000000 | /1 | |
| 0.0.0.0 | 00000000.00000000.00000000.00000000 | /0 |
Netmasks
Posted by John Sorensen on February 9th, 2009 
Posted in Other Tech
Posted in Other Tech 
Further Reading
- None Found
