1) Where can I register the nameservers?
2) I wonder if with a Cloud Server or dedicated the situation would be different.
3) Working with Ionos DNS, is better to disable DNS in Plesk or configure it as a Slave?
Assuming that you're asking these 3 questions in relation to 1and1 IONOS...
1) Go to
Domain /
NameServer /
Use Custom NameServers and you'll be prompted for of all the initial required details / changes in order to do this.
2) As mentioned, we use 1and1 IONOS Cloud Servers not 1and1 IONOS VPS and yes, it
might be different, but 1and1 IONOS Cloud Server and VPS Support Teams are different anyway, so we can't check for you, sorry.
3) As we posted previously, we simply disable DNS in Plesk and in our opinion (for our setup) we'd say that's enough. Why would we actually need Slave DNS? Not having this Slave DNS setup means less work / less config checks etc Other's may post valid reason for the exact opposite, but in our case, we don't see the requirement.
Only other thought is, if you do opt for custom nameservers, we think you may need to create glue records as well, to ensure everything work properly. This is not required when using the 1and1 IONOS Cloud Server DNS setup.
Finally, one minor point on 1and1 IONOS. We've ensured all our different domains are all under the same contract. So we simply need to login, select the domain (or the subdomain) and then make a change. With a cloud server these happpen very quickly so there's no
waiting for availabliilty but again 1and1 IONOS VPS may well be different