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DNS on Windows 2000, Second Edition by Cricket Liu, Matt Larson

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Name

PX (pointer to X.400/RFC 822 mapping information)

Textual representation:

                     owner ttl class PX preference RFC822 address X.400 address

Example:

ab.net2.it.  IN  PX  10   ab.net2.it.  O-ab.PRMD-net2.ADMDb.C-it.

Binary representation:

PX type code: 26
    +--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+
    |                  PREFERENCE                   |
    +--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+
    /                    MAP822                     /
    /                                               /
    +--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+
    /                    MAPX400                    /
    /                                               /
    +--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+

where:

PREFERENCE

A 16 bit integer which specifies the preference given to this RR among others at the same owner. Lower values are preferred.

MAP822

A domain-name element containing rfc822-domain, the RFC 822 part of the RFC 1327 mapping information.

MAPX400

A domain-name element containing the value of x400-in-domain-syntax derived from the X.400 part of the RFC 1327 mapping information.

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