NAPTR Record
In the Internet's Domain Name System (DNS), a Name Authority Pointer (NAPTR) is a type of resource record.
It is used for a number of different applications, and its unique usefulness comes from its ability to use regular expressions and to chain multiple records together to form complex rewrite rules which produce new domain labels or Uniform Resource Identifiers (URI's). A common use for NAPTR records is in SIP, where it is used to route VoIP telephone calls over the Internet.
As part of the DNS, it may also be used on networks which are not part of the internet.
The DNS type code for NAPTR is 35.
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