Can I keep my current domain registrar and switch to the Contabo name server?

Although it’s not recommended, you can keep the current registrar and just start using the Contabo DNS. 

To do that, please access DNS Zone Management page in the Customer Control Panel and create a new DNS zone. 

Once the DNS zone has been created, you can simply perform a name server update for your domain name and configure the following name servers as authoritative name servers for the domain:

ns1.contabo.net (79.143.182.242, 2a02:c205:0:0882::1)
ns2.contabo.net (178.238.234.231, 2a02:c205:0:0891::1)
ns3.contabo.net (5.189.191.29, 2a02:c207:0:0842::1)

In case that you are not sure how to perform a name server update for a third-party domain, we would recommend you get in touch with your domain registrar.