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Which of the following is the range of Class A public IPv4 addresses?

1. 0.0.0.0 to 223.255.255.255
2. 0.0.0.0 to 192.0.0.0
3. 0.0.0.0 to 127.255.255.255
4. 0.0.0.0 to 128.0.0.0

Correct answer: 0.0.0.0 to 127.255.255.255

Solution

In classful IPv4 addressing, Class A addresses have the first octet from 0 to 127. Therefore, the full range is 0.0.0.0 to 127.255.255.255. This is the standard Class A public IPv4 range asked in such questions.

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