How many usable IPs are in a /30?
Understand the Problem
The question is asking how many usable IP addresses are available in a subnet with a /30 CIDR notation. A /30 subnet mask allows for 4 IP addresses, but typically only 2 are usable for hosts, as one is reserved for the network address and one for the broadcast address.
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 network part is 30 bits long, leaving 2 bits for host addresses. This results in 4 total addresses, where the first address is the network address and the last address is the broadcast address, leaving 2 usable IPs for hosts.
Tips
Remember that in any subnet, the first IP address is reserved for the network and the last IP address is reserved for the broadcast.
Sources
- Help me understand a /30 subnet - Spiceworks - community.spiceworks.com
- Network Subnets (CIDR) and Usable IP Addresses Reference Guide - Deeserve - deeserve.co.uk
- /30 Subnet Mask - Netizzan - netizzan.com
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