NAPTR Lookup
Query NAPTR (Naming Authority Pointer) records for a domain. NAPTR powers ENUM, SIP and other URI-driven service discovery patterns.
Ready to Analyze
Enter a target value above or click any sample preset chip to generate real-time diagnostic output.
About the NAPTR Lookup Tool
The NAPTR Lookup tool queries Naming Authority Pointer records — a general-purpose DNS record (RFC 3403) used to rewrite a name into a URI or another DNS name for service discovery. NAPTR powers ENUM (mapping E.164 phone numbers to SIP URIs at `e164.arpa`), S-NAPTR/U-NAPTR for SIP/XMPP delegation, and various vendor discovery schemes.
Every NAPTR record carries an order and preference (for iteration), a flags field ('S' for SRV lookup, 'A' for A/AAAA, 'U' for URI rewrite, 'P' for protocol-specific), a service string (e.g. `SIP+D2T` for SIP over TCP), a regexp for substitution rewriting, and a replacement domain. Clients pick the lowest-order group, filter by matching service, apply the regexp, and continue resolution.
Use NAPTR Lookup to debug SIP/VoIP provisioning failures, verify ENUM entries for phone-number routing, or inspect how a domain publishes its discovery graph. Pair with our SRV Lookup — the two often work together when the NAPTR flags field is 'S'.
Enter the required value in the input field above (domain, IP, URL, or text depending on the tool).
Click the action button to run the check — results are computed instantly from our edge network.
Review the parsed output, key fields and any warnings shown in the result card.
Copy the result, share the page URL, or jump to a related tool from the sidebar to continue debugging.
- Parses order, preference, flags, service, regexp and replacement
- Sorted by order ascending
- Handles SIP, ENUM, S-NAPTR, U-NAPTR schemas
- Runs over DoH