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.
Sources
- Subnet Cheat Sheet – 24 Subnet Mask, 30, 26, 27, 29, and other IP ... - freecodecamp.org
- Help me understand a /30 subnet - community.spiceworks.com
- /30 Subnet Mask - Netizzan - netizzan.com
