How to use this tool
Enter a domain and record type. Leave both server fields blank for a provider comparison of public recursive resolvers. Enter both nameservers or public IPv4 addresses to query them directly on DNS port 53. Compares answers and response codes while ignoring order and TTL; this is not a full zone transfer.
Enter the target, complete any relevant options and choose Check. Review the requested records, query outcomes and diagnostic findings. Copy Report saves the visible report.
Reading the results
No matching records and an unavailable query are different outcomes. TTLs are displayed in seconds; zero is a valid TTL. A completed request does not mean a domain passed its health checks. Only the submitted DNS owner and explicitly listed checks are inspected.
Frequently Asked Questions
Does this tool query either nameserver?
No. It compares the two typed strings in the browser and makes no DNS or network request.
Why do uppercase and lowercase versions score as identical?
The edit-distance function converts both inputs to lowercase before comparing their characters.
What does Difference / Edit Steps measure?
It is the Levenshtein distance, meaning the minimum single-character insertions, deletions, or substitutions required to change one string into the other.
How is Similarity Index calculated?
The tool subtracts edit distance from the longer input length, divides by that length, and rounds the result to a percentage.
When does the potential spoof badge appear?
A similarity of 85 percent or higher receives HIGH SIMILARITY (POTENTIAL SPOOF). This is a text label, not a security verdict.
Can matching text prove two DNS zones are identical?
No. The tool does not retrieve zones or responses. Matching inputs only produce a matching lexical score.