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PTR - Domain Name Pointer
name {ttl} addr-class PTR real name
6.130 IN PTR monet.Berkeley.EDU.
A Domain Name Pointer record, PTR, allows special names to point to some other location in the domain. The example of a PTR record given here is used to set up reverse pointers for the special IN-ADDR.ARPA domain. PTR names should be unique to the zone. Note the period (.) appended to the real name to prevent named from appending the current domain name.
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