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DNS Zone File Validator & Conflict Checker

Inspect pasted DNS zone records for common syntax errors, duplicates, CNAME conflicts and mail-record issues.

Privacy: Your input is processed in the browser where supported and is not intentionally stored by this tool.

Result

Your output

Add the required input and run the tool.

What this tool covers

Inspect pasted DNS zone records for common syntax errors, duplicates, CNAME conflicts and mail-record issues. The result is based only on the source and settings supplied for the current run.

Input and verification

Check every entered value, unit and selected option, then rerun the tool with a second realistic example to confirm the workflow.

Important limitation

The checker supports common record forms and cannot confirm delegation, propagation or live authoritative DNS responses.

About DNS Zone File Validator & Conflict Checker

Inspect pasted DNS zone records for common syntax errors, duplicates, CNAME conflicts and mail-record issues. The result reflects only the source and settings supplied for the current run.

Before you use the result

Check every entered value, unit and selected option, then rerun the tool with a second realistic example to confirm the workflow.
The checker supports common record forms and cannot confirm delegation, propagation or live authoritative DNS responses.
Your input is processed in the browser where supported and is not intentionally stored by this tool.