| IP SPACE ALLOCATION CHART | |||
| NETMASK | NETMASK (BINARY) | CIDR | NOTES |
| 255.255.255.255 | 11111111.11111111.11111111.11111111 | /32 | Host (Single Address) |
| 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 | 254 Useable (Class C) |
| 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 | 2 Class A's |
| 252.0.0.0 | 11111100.00000000.00000000.00000000 | /6 | 4 Class A's |
| 248.0.0.0 | 11111000.00000000.00000000.00000000 | /5 | 8 Class A's |
| 240.0.0.0 | 11110000.00000000.00000000.00000000 | /4 | 16 Class A's |
| 224.0.0.0 | 11100000.00000000.00000000.00000000 | /3 | 32 Class A's |
| 192.0.0.0 | 11000000.00000000.00000000.00000000 | /2 | 64 Class A's |
| 128.0.0.0 | 10000000.00000000.00000000.00000000 | /1 | 128 Class A's |
| 0.0.0.0 | 00000000.00000000.00000000.00000000 | /0 | IP Space |