Resource a record (RR) is the smallest information unit in the Domain Name System (DNS). It arises in ASCII representation in zone files or in compressed form in DNS packages or DNS Caches. Some RR-types - so-called pseudo resource record - are used only in DNS packages.

RR-format in zone files

The format represented here refers to the ASCII representation, which is used in zone files. In Chaches or on the route of transportation a contents-same, but compressed form is used. RR-types are expressed for example by numbers between 1 and 255. Something similar applies to Class and TTL.

ASCII format: <name> [<ttl>] [<class>] <type> <rdata>

• <name> the domain name of the object, to which record belongs to the resource
• <ttl> Time to Live (in seconds). Validity resource of the record (optional)
• <class> group of minutes to that the resource record belongs. Usually IN (Internet) one uses. In addition, there is the classes CH (Chaosnet) or HS (Hesiod) as well as CS (CSNET, is not no more used and only still than example in some obsoleten RFCs mentioned) possible.
• <type> describes the type resource of the record. Here the most important types:
  • A IPv4-Adresse of a host
  • AAAA IPv6-Adresse of a host
  • A6 resource record of the procedure A6 for the partial address dissolution under IPv6, in the meantime becomes outdated
  • CNAME pseudonym for a host
  • DNAME similarly CNAME, but for IPv6
  • DNSKEY contains the name assigned publication IC keys - with DNSSEC starting from 2004 KEY replaced the type.
  • DS - serves the concatenation of DNSSEC marked zones
  • GPOS geographical position, becomes outdated
  • HINFO host information
  • ISDN ISDN number, is used only rarely
  • LOC Lokation
  • KEY contains the name assigned publication IC keys - by DNSSEC since 2004 no more one does not use
  • MT mailbox Domain Name (experimental)
  • MD Mail destination (no more in use - nowadays MX used)
  • MF Mail more forwarder (no more in use - nowadays MX used)
  • Mg Mail group more member (experimentally)
  • MINFO mailbox or mail cunning information
  • MR Mail rename Domain Name (experimental)
  • MX Mail Exchange - the Mailserver responsible for this Domain
  • NAPTR Naming Authority pointer - > to extension/alternative PTR resource of the record, see RFC 2915. Among other things used of ENUM (telephones NUMBER Mapping))
  • NSAP network service ACCESS POINT
  • Concatenated DNS entries in DNSSEC zones marked NANOSECOND (NEXT secure) - replaced 2004 the type NXT
  • ZERO zero resource record (experimental)
  • LV hostname of a autoritativen name server
  • OPT pseudo RR, marks a EDNS package
  • PTR Domain Name pointer (for the Reverse Mapping, in order to assign IP addresses names)
  • RP responsible person (responsible) person
  • RRSIG contains a digital signature (since 2004 by DNSSEC (=DNS Security) and replaces SIG is used)
  • SIG contains a digital signature (outdated, until 2004 used by DNSSEC (=DNS Security))
  • SOA start OF Authority
  • SRV offered service (service)
  • TXT free-definable text, is used among other things also for transmitter Policy Framework (SPF)
  • SPF native RR-type for transmitter Policy Framework (SPF)
  • WKS wave known service description
  • X25 X.25-Adresse, is used only rarely
• <rdata> (resource DATA) data those the resource record more near describe (for example a IP address for a A-RR, or a host name for a NS-RR)

Examples

test.example.de. IN A 172.30.0.7 test.example.de. IN TXT "“for DNS test"” ABC 1800 IN MX 10 test.example.de dns1 IN LV nameserver.beispiel.com. 7.0.30.172.in addr.arpa. IN PTR test.example.de. 

Articles in category "Resource record"

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