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The Dyn update API defines a minimum of 10 minutes as interval to not overload checkip.dyndns.org.
Thanks for the answer.
I would need it to be "faster". I have checked NoIP has a minimum interval of 5 minutes. Do you know another dynamic DNS provider that can support 1 or 2 minutes interval?
I do not know off-hand and would have to research at the providers' websites.
But I have the following hint for you. What update client are you using? If you configure the DDNS update client built-in in your router, then an interval does not take effect, because the router "knows" in real-time when the IP address changes and does not need to double-check against a site like checkip.dyndns.org You have an interval of 0 seconds then. This should ideally fit your needs.