Subnetting
| Group Size | Subnet Mask (Last Octet) | CIDR Octet | CIDR 3rd Octet | CIDR 2nd Octet | 1st CIDR |
|---|---|---|---|---|---|
| 128 | 128 | /25 | /17 | /9 | /1 |
| 64 | 192 | /26 | /18 | /10 | /2 |
| 32 | 224 | /27 | /19 | /11 | /3 |
| 16 | 240 | /28 | /20 | /12 | /4 |
| 8 | 248 | /29 | /21 | /13 | /5 |
| 4 | 252 | /30 | /22 | /14 | /6 |
| 2 | 254 | /31 | /23 | /15 | /7 |
| 1 | 255 | /32 | /24 | /16 | /8 |