【转】Classful IPv4 addressing definition
Classful addressing definition
Class | Leading bits |
Size of network number bit field |
Size of rest bit field |
Number of networks |
Addresses per network |
Total addresses in class |
Start address |
End address |
---|---|---|---|---|---|---|---|---|
Class A | 0 | 8 | 24 | 128 (27) | 16,777,216 (224) | 2,147,483,648 (231) | 0.0.0.0 | 127.255.255.255 |
Class B | 10 | 16 | 16 | 16,384 (214) | 65,536 (216) | 1,073,741,824 (230) | 128.0.0.0 | 191.255.255.255 |
Class C | 110 | 24 | 8 | 2,097,152 (221) | 256 (28) | 536,870,912 (229) | 192.0.0.0 | 223.255.255.255 |
Class D (multicast) | 1110 | not defined | not defined | not defined | not defined | 268,435,456 (228) | 224.0.0.0 | 239.255.255.255 |
Class E (reserved) | 1111 | not defined | not defined | not defined | not defined | 268,435,456 (228) | 240.0.0.0 | 255.255.255.255 |
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