Networking Guide
Chapter 6, Configuring the Domain Name Service

TXT (text) resource record

TXT (text) resource record

A TXT record contains free-form textual data. The syntax of the text depends upon the domain in which it appears; several systems use TXT records to encode user databases and other administrative data.

   name           {ttl}  addr-class  TXT string
   yukon.mynet.COM       IN          TXT "foo"

This functionality is not widely used on the Internet.