NAPTR records provide complex rewrite rules, often used in SIP, ENUM, or service discovery chains. They specify order, preference, flags, service, and replacement values that guide how a client should rewrite or resolve a domain. This lookup helps you verify the rule set and ensure the correct ordering.
Common issues include incorrect ordering, malformed regular expressions, or mismatched service fields. Because NAPTR is advanced and flexible, small errors can break service discovery. Verify the rule sequence and then confirm the next lookup step, usually SRV or URI based on the flags.
If you need related checks, try SRV record validator and TXT record check tool.
Order defines the sequence in which rules are processed. Preference is used to rank rules with the same order. Lower values are tried first.
Flags describe the next step, such as S for SRV lookup or U for a URI. The client behavior depends on the flag.
Check the regex syntax, service field, and replacement. Also verify the order and preference values.
Often yes. NAPTR can point to SRV records for service discovery.
Not always. SIP can use SRV and A/AAAA directly, but NAPTR can provide a more flexible discovery chain.
NAPTR is cached like other records. Use lower TTLs while adjusting complex rule sets.