Dyn - Dynamic DNS records

Dynamic DNS is a feature that allows you devices to automatically update the zone with changing IP addresses. 
For example, a CCTV or a soho router may have IP addresses assigned by the ISP via DHCP. 

Your Dyn Enterprise account has dynamic DNS built-in capabilities. 

To use dynamic DNS: 
* Create a Dynamic DNS user in the "Manage Account" section. 
* Go to the domain to modify, and switch to Simple Editor
* Edit or create the A record to be dynamic, and add the Dynamic DNS IPV4 service. 

* Alternatively, use the Dynamic DNS wizard from the Quick tasks menu. 

See this article for instruction on how to use the service
https://help.dyn.com/managing-dynamic-updates/