CIDR Calculator
Calculate IP ranges, subnet masks, and broadcast addresses from CIDR notation.
——————————————Enter a larger target prefix to generate child networks.
| Subnet | Network | Broadcast | Usable hosts |
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Frequently Asked Questions
What is the CIDR Calculator?
The CIDR Calculator is a browser-based reference and calculator for networking concepts including cidr addresses, subnets, and protocol details — useful for network engineers, DevOps professionals, and developers.
How do I look up cidr information?
Enter the relevant value such as an IP address, port number, or MIME type, and the tool instantly displays detailed information including descriptions, valid ranges, and related standards.
What networking standards does the CIDR Calculator cover?
The tool covers common networking standards including IPv4, IPv6, CIDR notation, well-known TCP/UDP port assignments, HTTP headers, and MIME types.
Does the CIDR Calculator work offline?
Yes. When installed as a PWA the entire reference database is cached locally and fully accessible without an internet connection — ideal for restricted or air-gapped environments.
Is the CIDR Calculator free?
Yes, completely free with no sign-up required. All networking reference data is available immediately in your browser.