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You are here: PacificCable.com 3.2.1. Format

3.2.1. Format

All RRs have the same top level format shown below:

where:

NAME

an owner name, i.e., the name of the node to which this resource record pertains.

TYPE

two octets containing one of the RR TYPE codes.

CLASS

two octets containing one of the RR CLASS codes.

TTL

a 32 bit signed integer that specifies the time interval that the resource record may be cached before the source of the information should again be consulted. Zero values are interpreted to mean that the RR can only be used for the transaction in progress, and should not be cached. For example, SOA records are always distributed with a zero TTL to prohibit caching. Zero values can also be used for extremely volatile data.

RDLENGTH

an unsigned 16 bit integer that specifies the length in octets of the RDATA field.

RDATA

a variable length string of octets that describes the resource. The format of this information varies according to the TYPE and CLASS of the resource record.