Free CIDR Calculator
This free cidr calculator runs entirely in your browser — no signup and no file uploads. Convert CIDR prefixes to masks and IP ranges, and inspect address space size quickly.
This tool runs in your browser. Your inputs are processed on your device and are not uploaded to ToolsForgeLabs servers for this calculation. Privacy Policy
Inputs
Results
- Network
- 10.0.0.0/8
- Mask
- 255.0.0.0
- Broadcast
- 10.255.255.255
- Address count
- 16777216
- Wildcard
- 0.255.255.255
How to use this free tool
- Enter CIDR or mask.
- Convert.
- Review range size.
- Copy results.
Examples
/20
Input: 10.0.0.0/20
Output: 4096 addresses; mask 255.255.240.0
Related searches
People looking for a cidr calculator often also search for cidr to subnet mask, cidr range, ip range cidr, prefix length calculator, cidr tool, and slash prefix calculator. This page covers that search cluster without duplicate URLs.
FAQ
CIDR vs subnet calculator?
CIDR emphasizes prefix/range conversion; subnet UI emphasizes host planning.
Can I convert mask to CIDR?
Yes—enter a dotted mask to get prefix length when valid.
IPv6?
This Phase 2 tool targets IPv4 CIDR.
How do I use a free cidr calculator?
This free cidr calculator runs entirely in your browser — no signup and no file uploads. Use the free tool above for instant results — no signup, browser-based, and private.
What is a cidr calculator?
This free cidr calculator runs entirely in your browser — no signup and no file uploads. Use the free tool above for instant results — no signup, browser-based, and private.
Is there a free online calculator for cidr?
This free cidr calculator runs entirely in your browser — no signup and no file uploads. Use the free tool above for instant results — no signup, browser-based, and private.
How does the cidr calculator work?
This free cidr calculator runs entirely in your browser — no signup and no file uploads. Use the free tool above for instant results — no signup, browser-based, and private.
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