Does it support /31 or /32 links?
Yes. /31 shows the two point-to-point addresses as usable, while /32 reserves the single host without a broadcast address.
Step-by-step walkthrough
Subnet Calculator Guide
Use this companion guide beside the interactive calculator to make sure you understand the “why” behind every click. Each section includes the classroom explanation, student-friendly language, and quick practice prompts.
Before you start
Collect the data points listed below and double-check their units. Keeping an organized “givens” list is one of the fastest ways to reduce math errors and impress exam graders.
- subnet calculator
- cidr
- ipv4
Detailed procedure
Step 1
Enter an IPv4 address such as 192.168.1.42 and set the CIDR prefix (0–32).
Step 2
Review the derived subnet mask, wildcard mask, network, and broadcast addresses.
Step 3
Copy the usable host range and capacity to plan VLANs, lab exercises, or certification homework.
Teaching & troubleshooting tips
What about IPv6?
This tool focuses on IPv4 subnetting today. IPv6 planning is on the roadmap as a separate calculator.