What Are NAPTR Records?
NAPTR records (Name Authority Pointer) are most commonly used for applications in Internet telephony, for example, in the mapping of servers and user addresses in the Session Initiation Protocol (SIP). The combination of NAPTR records with Service Records (SRV) allows the chaining of multiple records to form complex rewrite rules which produce new domain labels or uniform resource identifiers (URIs).
How to Configure NAPTR Records
1. Select Managed DNS and then click Domains
2. Select the domain you wish to add the NAPTR record to
3. In this screen you will enter the record information. Follow the steps below:
A. Name: The name of the record, can be left blank (at the root domain)
B. TTL: Time to live, how long the record is cached (measured in seconds)
C. Order: When multiple NAPTR records have the same preference number, order determines what comes first
D. Preference: Similar to MX level, with multiple NAPTR records, the one with the lowest order number is always tried first
E. Flags: There are currently four possible flags: "S" which denotes that an SRV lookup is to be performed on the output of this NAPTR record. "A" means the result should be looked up as an "A", "AAAA" or "A6" record. A "U" means that the NAPTR result is an absolute URI that the application should process. A "P" would signify a "non-terminal" rule where additional NAPTR lookups would be necessary. It is application specific and can be mutated by regular expressions.
F. Service: application specific service options for reaching the domain. EX: "SIP+D2U" is SIP over UDP
G. Regular Expression: used to mutate the original request into something new. You could use this to substitute the entire name or parts of the name used in the original query. If you have a regular expression, you cannot have a replacement.
H. Replacement: The replacement is used as the "result" of the NAPTR lookup instead of mutating the original request as the regular expression in the paragraph above. If you have a replacement, you cannot have a regular expression.
I. Notes: Add any notes about the record that may be helpful to you in the future.
Don't forget to click Save!