Generally, the TXT (TXT record) entry is used when setting up a domain to point to an e-mail server.
I'd like to know what the goal of TXT is.
What is a TXT entry?
How do I read the TXT setting for a given domain?
Who cares if I have a TXT configured in my domain?
What are the advantages of knowing this in day-to-day programming?
How many TXT registrations can I have per domain?
I'll try to be as objective as possible in the answers:
What is a TXT entry for? A TXT record is a resource record type in DNS that contains text information from sources outside your domain used to associate arbitrary text with a host such as readable information about a server, network, and so on. You can use TXT records to prevent phishing and spamming.
How do I read the TXT configuration for a given domain? As Jose Maia said, to read the configuration, it is done in the same way as any other DNS lookup, i.e. NSLookup.exe -q = TXT example.com or dig -t txt example.com.
Who cares if I have a TXT set up in my domain? The domain host maintains the DNS records, which direct Internet traffic to its domain name. When you add a record check TXT DNS records from your domain host. if you do some verification (for example by Google to use services like G Suite), your domain ownership is confirmed.
What are the advantages of knowing this in day-to-day programming? The main focus is to have an overview of whether you have a TXT record confirms that you are the owner of your domain, for example when Google or Office365, etc., see the record, the ownership of the domain is confirmed.
How many TXT records can I have per domain? A domain can have multiple TXT records associated with it, as long as the implementation of the DNS server supports this. However, you can not have more than one TXT record for the SPF (Sender Policy Framework) of a domain. If the domain has more than one SPF record, you will receive email errors as well as spam rating and delivery issues.
Note: The verification log does not affect your website or email.
The purpose of the TXT entry is to place arbitrary text. This leads to different websites using this for different purposes, not having a 'generic' use case.
One example is Google: To use their business suite (G Suite) see details here) , the user is asked to enter information in their DNS configuration, so that Google can confirm that this user actually owns the DNS in question. Another example is the use of the SPF mentioned above in the context of the mail server.
According to the RFC that defines the TXT records , there is no explicit size limit or TXT record numbers, and there may be implementations of DNS servers that enforce this limit or until they do not support TXT records.
To read the configuration, it is done in the same way as any other DNS lookup, i.e. NSLookup.exe -q=TXT example.com or dig -t txt example.com .
