Address Pointer) is one of the most commonly used DNS record in
telecommunications domain. NAPTR records map the Internet telephony address
space to the Internet address space. They therefore enable a mobile device to
send a request to the correct server. The combination of NAPTR records with
Service Records (SRV) allows the chaining of multiple records to form complex
rewrite rules that produce new domain labels or uniform resource identifiers
(URIs). The DNS code for NAPTR is 35.
support NAPTR in two modes: ADNS mode and proxy mode. In proxy mode, the ADC
caches the response from the servers and uses the cached records to server
future queries. A maximum of 20 NAPTR records can be added for a particular
domain in NetScaler. NetScaler caches the reply to a DNS NAPTR record query.
Any subsequent requests for the NAPTR record is served from the cache.