Which DNS record is used to store unstructured text data?

Which DNS record is used to store unstructured text data?

• A. TXT
• B. HINFO
• C. PTR
• D. RP

Answer: (A)

Unstructured text data is stored in a TXT record. A TXT record in DNS is specifically designed to hold arbitrary text strings associated with a domain, making it flexible for various uses such as domain verification, SPF, DKIM, and DMARC policies. Each TXT string can be up to 255 bytes, and multiple strings can be combined to form longer text data, which resolvers concatenate when presenting the full value. Other records have more fixed, structured purposes. HINFO describes host hardware and OS, which is a narrow use case not intended for general text. PTR is used for reverse DNS lookups, mapping an IP address back to a domain name, not for storing textual data about a domain. RP (Responsible Person) was historically used to indicate the mailbox of the domain administrator and is largely obsolete.

Unstructured text data is stored in a TXT record. A TXT record in DNS is specifically designed to hold arbitrary text strings associated with a domain, making it flexible for various uses such as domain verification, SPF, DKIM, and DMARC policies. Each TXT string can be up to 255 bytes, and multiple strings can be combined to form longer text data, which resolvers concatenate when presenting the full value.

Other records have more fixed, structured purposes. HINFO describes host hardware and OS, which is a narrow use case not intended for general text. PTR is used for reverse DNS lookups, mapping an IP address back to a domain name, not for storing textual data about a domain. RP (Responsible Person) was historically used to indicate the mailbox of the domain administrator and is largely obsolete.