How many usable IP addresses are in a /30?

Understand the Problem

The question is asking for the number of usable IP addresses within a /30 subnet, which is a range of IP addresses defined by the prefix length. In a /30 subnet, the number of usable IP addresses is typically calculated by taking the total number of addresses (2^2 for the 2 remaining bits) and subtracting 2 (for the network and broadcast addresses). Thus, effectively there are 2 usable IP addresses.

Answer

2 usable IPs.

The final answer is 2 usable IPs.

Answer for screen readers

The final answer is 2 usable IPs.

More Information

In a /30 subnet, the first and last IP addresses are reserved for the network address and the broadcast address, leaving 2 IP addresses for actual host assignment.

Tips

A common mistake is not accounting for the reserved network and broadcast addresses when calculating the number of usable IPs.

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