What Is A DNS PTR Record?

The PTR record is used for reverse DNS lookups.

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DNS PTR Record

学習目的

この記事を読み終えると、以下のことができます。

  • Understand the purpose of an PTR record.

What is a DNS PTR record?

The ‘pointer’ record is exactly the opposite of the ‘A’ record; the PTR address will give you the domain associated with a given IP address. The PTR record is used in reverse-lookup zones for reverse DNS searches.

Example of an PTR record:

example.com record type: value: TTL
@ PTR example.com 71200

The value here represents an email address ,which can be confusing because it’s missing the ‘@’ sign, but in an SOA record admin.example.com is the equivalent of admin@example.com.