 |
|
| Netmask (Decimal) |
Netmask (Hexadecimal) |
CIDR |
Available IPs |
| 255.255.255.255 | FF:FF:FF:FF | /32 | Host (single addr) |
| 255.255.255.254 | FF:FF:FF:FE | /31 | Unuseable |
| 255.255.255.252 | FF FF FF FC | /30 | 2 |
| 255.255.255.248 | FF FF FF F8 | /29 | 6 |
| 255.255.255.240 | FF FF FF F0 | /28 | 14 |
| 255.255.255.224 | FF FF FF E0 | /27 | 30 |
| 255.255.255.192 | FF FF FF C0 | /26 | 62 |
| 255.255.255.128 | FF FF FF 80 | /25 | 126 |
| 255.255.255.0 | FF FF FF 00 | /24 | 254 |
|
-- Class C addresses --
|
| 255.255.254.0 | FF:FF:FE:00 | /23 | 2 Class C's |
| 255.255.252.0 | FF:FF:FC:00 | /22 | 4 Class C's |
| 255.255.248.0 | FF:FF:F8:00 | /21 | 8 Class C's |
| 255.255.240.0 | FF:FF:F0:00 | /20 | 16 Class C's |
| 255.255.224.0 | FF:FF:E0:00 | /19 | 32 Class C's |
| 255.255.192.0 | FF:FF:C0:00 | /18 | 64 Class C's |
| 255.255.128.0 | FF:FF:80:00 | /17 | 128 Class C's |
| 255.255.0.0 | FF:FF:00:00 | /16 | 254^2 +/- |
|
-- Class B addresses --
|
| 255.254.0.0 | FF:FF:00:00 | /15 | 2 Class B's |
| 255.252.0.0 | FF:FE:00:00 | /14 | 4 Class B's |
| 255.248.0.0 | FF:F8:00:00 | /13 | 8 Class B's |
| 255.240.0.0 | FF:F0:00:00 | /12 | 16 Class B's |
| 255.224.0.0 | FF:E0:00:00 | /11 | 32 Class B's |
| 255.192.0.0 | FF:C0:00:00 | /10 | 64 Class B's |
| 255.128.0.0 | FF:00:00:00 | /9 | 128 Class B's |
| 255.0.0.0 | FF FF:00:00 | /8 | 254^3 +/- |
|
-- Class A addresses --
|
| 254.0.0.0 | FE:00:00:00 | /7 | 2 Class A's |
| 252.0.0.0 | FC:00:00:00 | /6 | 4 Class A's |
| 248.0.0.0 | F8:00:00:00 | /5 | 8 Class A's |
| 240.0.0.0 | F0:00:00:00 | /4 | 16 Class A's |
| 224.0.0.0 | E0:00:00:00 | /3 | 32 Class A's |
| 192.0.0.0 | C0:00:00:00 | /2 | 64 Class A's |
| 128.0.0.0 | 80:00:00:00 | /1 | 128 Class A's |
| 0.0.0.0 | 00:00:00:00 | /0 | IP4 space as we know it |