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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 |
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