IP Address: An Introductory Guide
IP addresses for subnets or classes
| Class | Leading bits in First Octate | Number of Networks | Addresses per network | Total Addresses in Class | Range | Remarks |
|---|---|---|---|---|---|---|
| Class A | 0 00000000: 00000000: 00000000: 00000000 | 128 (27) | 16,777,216 (224) | 231 | 0.0.0.0 – 127.255.255.255 | N:H:H:H 00000000: 00000000: 00000000: 00000000 |
| Class B | 10 10000000: 00000000: 00000000: 00000000 | 16,384 (214) | 65,536 (216) | 230 | 128.0.0.0 – 191.255.255.255 | N:N:H:H |
| Class C | 110 11000000: 00000000: 00000000: 00000000 | 2,097,152 (221) | 256 (28) | 229 | 192.0.0.0 – 223.255.255.255 | N:N:N:H |
| Class D | 1110 11100000: 00000000: 00000000: 00000000 | Not defined | Not defined | 228 | 224.0.0.0 – 239.255.255.255 | Reserve for multitasking |
| Class E | 1111 11110000: 00000000: 00000000: 00000000 | Not defined | Not defined | 228 | 240.0.0.0 – 255.255.255.255 | Reserved for Research and development |
