DNS Message Resource Record Field Formats
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RData Field Formats For Common Resource Records
The RData field consists of one or more subfields that carry the actual payload for the resource record. Below is a list of the most common resource record types. For each I have indicated the resource record text code, name, and Type value, provided a brief summary of the resource records use, and shown the structure of the RData field in a table:
This is the primary resource record type in DNS; it contains a 32-bit IP address associated with a domain name, as shown in Table 172.
In this record, the data field carries the domain Carries the domain name of a name server (Table 173).
The data field contains the real name of an a named object that has been referenced using an alias (Table 174).
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