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SPF Record Builder
Build an SPF TXT value from approved IP networks, include domains and an all policy.
IP CIDRs, one per line, Include domains, one per line
spf-record-builder.json (complete report and generated source where applicable)
Browser only
Runs locally in your browser. Your files, pasted content and generated output are not uploaded. Reset clears this tool’s working data.
This tool needs JavaScript. If it does not load, refresh the page and try again.
How to use this tool
- Enter values using the displayed examples; observe the documented input shape and limits.
- Choose Calculate result. Review the complete JSON report and any generated source text it contains.
- Download result to save the complete report; copy the generated source member into your project when relevant. Reset restores examples and clears output.
Examples
IP CIDRs, one per line: 192.0.2.0/24
Include domains, one per line: _spf.example.com
All qualifier: -all
Limitations
- IPv4/hex IPv6 CIDRs and DNS includes only. No macros, recursive DNS lookup count, live DNS or deliverability check. Maximum 10 explicit include terms.
- Maximum 100,000 UTF-16 units per field, 400,000 UTF-8 combined input bytes, 4 MiB output and 30 seconds in a local worker. Tool-specific bounds may be tighter.
- Generated snippets are source text inside the JSON download. They are never executed by this tool. Local inspection does not verify remote systems or establish standards certification.
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