Pointer Record (PTR)

Example 5–31 shows the syntax for a PTR resource record.

Example 5–31 PTR Record Format

 special-name	[optional TTL]  class	 PTR-real-name

A pointer record allows special names to point to some other location in the domain. In the example, PTRs are used mainly in the in-addr.arpa. records for the translation of an address (the special name) to a real name. When translating an address, if the domain is fully qualified only the machine identification number need be specified. PTR names should be unique to the zone. The PTR records Example 5–32 sets up reverse pointers for the special in-addr.arpa domain.

Example 5–32 Sample PTR Resource Record

;special name   [TTL]	class	PTR-real-name
1			IN	PTR sirius.doc.com.