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
|