Read a domain's DNS NAPTR rules

Telecom and messaging teams can use this during a routing investigation to review every NAPTR rule and spot an incorrect replacement.

Trace the NAPTR rules published by a domain, from order and preference to replacement, and understand the rewrite path it actually advertises.

How to use

Enter the domain whose NAPTR rules you want to inspect in the input field.
Start the test so the query is sent and the matching records are displayed.
For each rule, read the order, the preference and the replacement target that the domain advertises.
Look for a rule that points to an unexpected replacement or that seems to duplicate another one.
Clear the field to run the same check on another domain, such as a backup service domain.

Example

A telecom team finds that calls routed through a domain do not follow the expected path. Reading the published NAPTR rules shows whether the advertised rewrite matches the service in use, and whether an outdated rule is still sitting in the zone.

Limits and formats

NAPTR records only describe an advertised rewrite intention; the tool cannot show how a given operator actually applies them.
Domains with no NAPTR rule return nothing, which is perfectly normal for most ordinary websites.
The values shown reflect the moment of the query, so a zone being edited may answer differently a few minutes later.

Where processing happens

The request is handled by the YOORfree server, which queries the public DNS itself for NAPTR rules and then passes the answer back to you. No file is uploaded with the query.

Frequently asked questions

What is a NAPTR record actually used for?

It describes how an identifier, such as a phone number or a service name, should be rewritten to another form or another target. It appears mainly in telecom and messaging routing chains.

Why are order and preference displayed together?

Order ranks the rules by application sequence, and preference breaks ties between rules that share the same order. Reading both values together tells you which rule is considered first.

Can the result tell me that a rule is wrong?

No, the page only reports what the domain publishes. You have to compare those rules with the ones your operator or service provider expects to see.