CIDR Prefix to IPv4 Range & Subnet Calculator
Calculate start IP, end IP, broadcast, subnet mask, and usable hosts from CIDR prefix notations.
Execution runs 100% locally inside the browser sandbox using HTML5 Canvas, Web Cryptography Subtle API, and Web Workers. No data is ever transmitted across the network.
Zero network latency. Operates completely offline with zero dependencies on third-party backend servers or cloud services.
Built according to official RFC specifications, cryptographic test vectors, and enterprise-grade data transformation standards.
How to Use CIDR Prefix to IPv4 Range & Subnet Calculator
Type any IPv4 CIDR block (e.g. 192.168.1.0/24).
View network address, usable host ranges, and binary masks.
Copy the calculation breakdown to your clipboard.
Frequently Asked Questions
What is a /24 subnet?
A /24 subnet provides 256 total IP addresses and 254 usable host addresses with a 255.255.255.0 mask.
Does it support /31 and /32 point-to-point links?
Yes, RFC 3021 point-to-point /31 subnets are accurately evaluated.
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