Naming Authority Pointer
Quick facts
Purpose
Naming Authority Pointer
NAPTR is one of the DNS resource record (RR) types defined by RFC 3403.
Example
example.com. 3600 IN NAPTR 100 10 "u" "E2U+sip" "!^.*$!sip:info@example.com!" .
Related record types
Common uses
Format
example.com. 3600 IN NAPTR 100 10 "u" "E2U+sip" "!^.*$!sip:info@example.com!" .
| Field | Explanation |
|---|---|
| Order | Processing order (low first). |
| Preference | Preference within an order. |
| Flags | u = terminal (URI). |
| Service / Regexp | Service parameters and rewrite rule. |
Common services
Frequently asked questions
SIP and telephony routing rules, ENUM number mapping
In the DNS management panel of your registrar or DNS provider (for example Cloudflare or Route53).
Sources & standards
Updated 2026-09-13
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