| Allocation Size |
Number of /24s |
Number of Host
Addresses |
| /32 |
<1 |
1 |
| /31 |
<1 |
2 |
| /30 |
<1 |
4 |
| /29 |
<1 |
8 |
| /28 |
<1 |
16 |
| /27 |
<1 |
32 |
| /26 |
<1 |
64 |
| /25 |
<1 |
128 |
| /24 |
1 |
256 |
| /23 |
2 |
512 |
| /22 |
4 |
1,024 |
| /21 |
8 |
2,048 |
| /20 |
16 |
4,096 |
| /19 |
32 |
8,192 |
| /18 |
64 |
16,384 |
| /17 |
128 |
32,768 |
| /16 |
256 |
65,536 |
| /15 |
512 |
131,072 |
| /14 |
1,024 |
262,144 |
| /13 |
2,048 |
524,288 |
| /12 |
4,096 |
1,048,576 |
| /11 |
8,192 |
2,097,152 |
| /10 |
16,384 |
4,194,304 |
| /9 |
32,768 |
8,388,608 |
| /8 |
65,536 |
16,777,216 |
|
Subnet Mask Number
255.255.255.x
|
Increment
(i.e. IP number)
|
| 255 |
1 |
| 254 |
2 |
| 252 |
4 |
| 248 |
8 |
| 240 |
16 |
| 224 |
32 |
| 192 |
64 |
| 128 |
128 |
IANA IPv4 Address Space Registry
|