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DNS is normally used, in order to determine to a name the associated (n) IP address (n). In some cases also the reverse dissolution is necessary. The IP address is well-known, but not the name.

To the Reversen dissolution PTR resource record (pointer resource record) is necessary. PTR resource record may appear only in in-addr.arpa-Domain (for the Reverse Lookup of IPv4-Adressen) and/or ip6.int and ip6.arpa (for the Reverse Lookup of IPv6-Adressen).

Structure

IP address IP address in reverse order the KomponentenTTL indicates, like for a long time the RR in the Cache to be held may (TTL: Time-ton-live) IN InternetPTRName of the IP address assigned name

Example (IPv4)

1.0.0.10.in addr.arpa. 3600 IN PTR test.example.com.

In this example became a Client, which asks a DNS server for the IP address 10.0.0.1, when test.example.com receive answer.

Example (IPv6)

1.0.0.0 .0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.8.b.d.0.1.0.0.2.ip6.arpa. 3600 IN PTR test-ipv6.example.com.

In this example a Client became, that after the IPv6-Adresse 2001: db8:: 1 asks, when test-ipv6.example.com receive answer.


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» Paul Mockapetris
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