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| CIDR/Default Subnet Mask Table | |||||||
|---|---|---|---|---|---|---|---|
| Class A | Class B | Class C | |||||
| Binary (N/H) | Decimal | Block size | Interesting Octet | (2nd octet) | (3rd octet) | (4th octet) | |
| 00000000 | = 0 | 256 | /8 | /16 | /24 | ||
| 10000000 | = 128 | 128 | /9 | /17 | /25 | ||
| 11000000 | = 192 | 64 | /10 | /18 | /26 | ||
| 11100000 | = 224 | 32 | /11 | /19 | /27 | ||
| 11110000 | = 240 | 16 | /12 | /20 | /28 | ||
| 11111000 | = 248 | 8 | /13 | /21 | /29 | ||
| 11111100 | = 252 | 4 | /14 | /22 | /30 | ||
| 11111110 | = 254 | 2 | /15 | /23 | |||
| 11111111 | = 255 | 1 |