I'd like to test this, but I cannot figure out what I need to do. I have logged in via my Google credentials. I had thought I'd set a third-level domain, but do not know ho to view it.

What I want to do is to run an IIS server on a windows 10 laptop. The router I'm behind maps port 80 & 423 to the laptop. However, even though I have a domain with DDNS from google, nothing seems to work.

Have you a set of directions I can follow to set this up? (Win10 IIS server referenced via a DDNS domain name)

Thank you;
Patrick

You can list Dynu name servers (ns1.dynu.com-ns5.dynu.com) at Google and sign the domain name up at the DDNS signup page Option 2 to use Dynu's DDNS/DNS service.

I use GoDaddy to host my domain and I followed you suggestion. I signed my domain with Option 2 and I configured the nameservers from Dynu with GoDaddy.
The problem is, that when changing the nameservers with GoDaddy I loose all my DNS entries from GoDaddy. They say you can only use DNS entries when you use their nameservers.
So where do I put my DNS entries now? Can I do that on Dynu? Where?

Go to the control panel DDNS Services page. Click on your domain name and configure the DNS records in the DNS Records section.