Check out these advanced records definitions and examples.
TXT Records: Text records are used to describe a host or a DNS entry. You can enter anything you want as long as it is 255 characters or less. This feature is only available on Enhanced, Plus, or Pro DNS. Many common records types are added as a TXT record. For instance, SPF records are added as TXT records. You can see TXT records on your, or any domain by using using the dig tool In Terminal or Command Prompt.
dig txt yourdomain.com
SPF Records (Sender Policy Framework): Are used to prevent email forgery and help identify spam. To create an SPF record on No-IP.com, just manage your TXT record and use the SPF wizard to create an entry. This feature is only available on Enhanced, Plus, or Pro DNS.
DKIM records (Domain Key Records): Are used for email to verify the identity of the sending server to help cut down on spam. Want to add a DKIM record to your host? From the ‘DNS Records‘ tab select the host you’d like to modify and then click on the ‘TXT’ link under the Advanced Records section. This feature is only available on Enhanced, Plus, or Pro DNS.
SRV records: An SRV record describes services offered by a host. It defines the location of a server (port number and hostname). They are commonly used in SIP (Session Initiation Protocol) and XMPP Extensible Messaging and Presence Protocol protocols. This feature is only available on Enhanced Plus, or Pro DNS.