DNS records reference

A Record (IPV4 Address record)

Maps a domain name to an IPv4 address.

Example: Map example.com to 192.0.2.1.

AAAA Record (IPV6 Address record)

Maps a domain name to an IPv6 address.

Example: Map example.com to 2001:0db8:85a3:0000:0000:8a2e:0370:7334.

CNAME (Canonical Name Record)

Used to alias one domain to another. For example, if you want to point blog.example.com to exampleblog.com. The target domain must already have its own A or AAAA record.

MX Record (Mail Exchange Record)

Used to specify the mail servers responsible for receiving email on behalf of a domain. It includes a priority field which is used to specify the order in which the mail servers should be used.

TXT Record

A DNS entry that stores text information about a domain. It’s commonly used for domain ownership verification and email spam protection.

Domain ownership verification

A third-party service (e.g., LetsEncrypt) will ask you to add a TXT record and then do a DNS look-up to check if that TXT record exists. If it does, it knows you control that domain and can then do something like issue SSL certificates. You can look up TXT records for any domain using a service like dnschecker.org.

Email spam protection

TODO