Hi

Just wondering how many NS do I need to list in my registrar. Is 5 or just 3?

ns1.dynu.com
ns2.dynu.com
ns3.dynu.com

or

ns1.dynu.com
ns2.dynu.com
ns3.dynu.com
ns4.dynu.com
ns5.dynu.com

To register a domain name you need to provide a minimum of two name servers (a primary and a backup) so two is the minimum. However you can list all 10 of them it doesn't really matter.

In my case I provided two name servers to my registrar but after a few days they updated my name server settings to match the response from the Dynu name servers.