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Txt record

The meaning of «txt record»

A TXT record (short for text record) is a type of resource record in the Domain name system (DNS) used to provide the ability to associate arbitrary text with a host or other name, such as human readable information about a server, network, data center, or other accounting information.[1]

It is also often used in a more structured fashion to record small amounts of machine-readable data into the DNS.

A domain may have multiple TXT records associated with it, provided the DNS server implementation supports this.[2] Each record can in turn have one or more character strings.[3] Traditionally these text fields were used for a variety of non-standardised uses, such as a full company or organisation name, or the address of a host.

In 1993 RFC 1464 proposed a simple approach to storing attributes and their values in these text fields. This is now used extensively in:

As unstructured text, organisations can use the TXT string in any way they define, for example:

example.com. IN TXT "This domain name is reserved for use in documentation"

RFC 1464 defines a structured format that can be used to define attributes and their values in a single record,[2] as in these examples:

host.widgets.com. IN TXT "printer=lpr5" sam.widgets.com. IN TXT "favorite drink=orange juice"

In practice, services using TXT records often do not follow this RFC, but instead have their own specific format.[10][11]

The character string from a TXT record used for SPF:

"v=spf1 ip4:192.0.2.0/24 ip4:198.51.100.123 ip6:2620:0:860::/46 a -all"

An example of use for DMARC:

"v=DMARC1;p=none;sp=quarantine;pct=100;rua=mailto:dmarcreports@example.com;"

Use for site verification:

"google-site-verification=6P08Ow5E-8Q0m6vQ7FMAqAYIDprkVV8fUf_7hZ4Qvc8"

Use for custom email service:

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