|
Start with 128 then divide by 2 for each value |
Reverse the order of the Bit Values |
= Subnets - 2 |
= Bit Value - 2 |
= Cumulative Sum of Bit Value |
= Total Bit Value |
=24 + Bits Borrowed |
Borrowed Bits |
Bit Value |
Subnets |
Usable Subnets |
Usable Hosts |
Total Bit Value |
Subnet Mask |
Network Bits |
1
| 128
| 2 |
0 |
126 |
128 |
255.255.255.128 |
/25 |
2
| 64
| 4
| 2
| 62
| 192
| 255.255.255.192
| /26 |
3
| 32
| 8
| 6
| 30
| 224
| 255.255.255.224
| /27 |
4
| 16
| 16
| 14
| 14
| 240
| 255.255.255.240
| /28 |
5
| 8
| 32
| 30
| 6
| 248
| 255.255.255.248
| /29 |
6
| 4
| 64
| 62
| 2
| 252
| 255.255.255.252
| /30 |
7
| 2
| 128
| 126
| 0
| 254
| 255.255.255.254
| /31 |