Troubleshoot DNS and address planning
Look up public DNS records, then calculate CIDR ranges and usable hosts for network changes.
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Network Tools
Check DNS, subnets, public endpoints, and network-related data with clear limitations and copyable diagnostics.
2 toolsNo signupBrowser-first
Inspect DNS records and propagation
Use this category when you need a quick result without opening a heavy app or creating an account.
Calculate CIDR subnets and address ranges
Use this category when you need a quick result without opening a heavy app or creating an account.
Copy commands for deeper local diagnostics
Use this category when you need a quick result without opening a heavy app or creating an account.
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Useful network workflows
How to use this category
Start with one of the highlighted tools, paste or enter only the data needed for the task, then copy the result into your own workflow. Each tool page explains its assumptions and limits where they matter.
Privacy and quality note
Some tools in this category use public network lookups or URL checks. Those pages disclose what is sent before you use them.
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Network tools FAQ
Why can network results differ from my terminal?
Browser and public resolver checks may differ from local, private, cached, or split-horizon DNS results.
Do these tools scan ports?
No broad scanning is planned. Network tools stay narrowly scoped to safe lookups and calculators.