Field Name

Size (bytes)

Description

Name

Variable

Name: Contains the object, domain or zone name that is the subject of the resource record, encoded using standard DNS name notation. All of the information in the resource record is associated with this object, which I call the named object for the record.

Type

2

Type: A code value specifying the type of resource record. The type values for the most common kinds of resource records are shown in Table 166 and also in the list of resource record details in this topic.

Class

2

Class: Specifies the class of the resource record being requested, normally the value 1 for Internet (“IN”). See the end of the topic on classes and resource record types for an explanation.

TTL

4

Time To Live: Specifies the number of seconds that the record should be retained in the cache of the device reading the record. See the topic on DNS name server caching for a full explanation. A value of zero means “use this information for the current name resolution only; do not cache it”.

RDLength

2

Resource Data Length: Indicates the size of the RData field, in bytes.

RData

Variable

Resource Data: The data portion of the resource record.