| 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 |