The Fritz!Box is a very popular router which is mostly delivered by the internet provider. This router can be configured with our dyndns service.
More information about the router are available here -> wikipedia

Fritz!Box

• Open the web interface of your Fritz!Box
• Open "Internet" -> "Permit Access" -> "DynDNS"
• As DynDNS Provider choose "User-defined"
• As "Update URL" "https://myonlineportal.net/updateddns"
• As "Domain name" your complete MyOnlinePortal domain
• As "User name" your MyOnlinePortal username
• As "Password" your MyOnlinePortal password

IPv6 and IPv4 Update parallel

• As "Update URL" "https://myonlineportal.net/updateddns?hostname=<Domain name>&ip=<ipaddr>&ip6=<ip6addr>"
  The Fritz!Box is replacing <ipaddr> and <ip6addr> with the corresponding addresses for your internet connection.
  As <Domain name> your complete MyOnlinePortal domain

When problems occur

• Add parameters to the "Update URL"
• hostname=<Your Domain name>
• username=<Your username>
• password=<Your password>
• Complete it can look like follows

https://myonlineportal.net/updateddns?hostname=<Domain name>&username=<Your username>&password=<Your password>