CIDR Calculator
NetTool
Calculate CIDR notation, subnet mask, and IP ranges from network addresses.Updated 2026-03-20
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Frequently Asked Questions
What is CIDR?
Classless Inter-Domain Routing notation for IP networks.
What range?
/0 to /32 for IPv4.
Free?
Yes, completely free.
How to Use
- Copy data or export report
- Check status indicators
- Enter domain, IP, or URL to check
- Click Lookup or press Enter
FAQ
Is my query logged?
No. Queries processed in real time and not stored.
Can I check any domain?
Yes, any publicly accessible domain or IP. Private addresses are not reachable.
How accurate are results?
Queries authoritative sources in real time. Results reflect current network state.
How often should I check?
After DNS changes, wait 24-48h for propagation then verify. Monitor weekly for changes.
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