Cybersecurity &
Networking Tools
Turn complex network tasks into simple clicks with fast, accurate, and intuitive cybersecurity utilities
IPv6 Subnet Calculator
Calculate network prefix, range of addresses, and notation details from an IPv6 address and CIDR.
Subnet Calculator
Summary
The Subnet Calculator tool allows you to instantly analyze and calculate network details from any IPv4 address and subnet mask or CIDR. It’s ideal for engineers, sysadmins, and students who need quick and accurate subnetting results.
What is a Subnet Calculator?
A Subnet Calculator helps compute IP subnet information such as network address, first/last usable IPs, host counts, and wildcard mask. It simplifies the otherwise manual process of subnetting IP ranges.
Why Use This Tool?
- Instant subnetting output
- Easy CIDR dropdown
- Dark mode support
- Copy and share results quickly
How to Use the Subnet Calculator
- Input a valid IPv4 address
- Enter subnet mask or select CIDR
- Click “Calculate” to see the subnet details
- Use “Copy Result” or “Send Feedback” if needed
Key Features
- Supports CIDR and traditional masks
- Outputs network, broadcast, wildcard, and usable IPs
- Responsive layout with copy/share features
Frequently Asked Questions
What is CIDR?
CIDR (Classless Inter-Domain Routing) is a notation like /24 that represents how many bits are used for the network portion of an IP.
What is a wildcard mask?
The wildcard mask is the inverse of the subnet mask and is used in firewall and ACL configurations.
Can I use this for IPv6?
This tool is built for IPv4 only at the moment.
🚩 Found a Bug or Have Suggestions?
If something didn’t work as expected or you have a feature idea, let us know.
Disclaimer
The Subnet Calculator is provided as-is for informational use. Results are calculated in the browser and should be verified for critical production networks. NetSecureTools.com is not liable for configuration errors or misapplications of the tool.