Dynamic DNS is a feature that allows automatic update of your DNS's A or AAAA records, if your IP address is changed. If you have a server at home and host a website on your computer and you don’t have a static IP, the IP changes each time you reconnect to the Internet. To avoid manual update of your records everytime your IP changes, you can set up Dynamic DNS for your domain.
On every A and AAAA record you will see an icon with two arrows. When you click on them you will see the DynamicURL for this record. Every time you open this URL the record will be changed to the IP address of the computer the URL is opened from. On this window you will see options to open this URL with wget, php and perl scripts automatically.
Many Internet Service Providers (ISPs) use NAT even for the Wide Area Network (WAN) IP address. This usually makes it harder to use Dynamic DNS, as thousands of other users could be using the same IP address you appear with on the Internet.
To check whether this is the case with you, we suggest you open the Dynamic IP Update URL in your browser once you activate the Dynamic DNS on your A/AAAA record. Afterwards, please check the new IP address assigned to the A/AAAA record and open your router settings. If the IP address of the A/AAAA record matches your router's WAN IP, you are the only client behind this IP address and setting up Dynamic DNS will work for you as intended.
However, if the IP addresses do not match, many clients use the same IP. In this case, we recommend contacting your ISP to find the available options.