I’ve a website which is often (actually most of the times) is down. I am using one company as a registar and another as a host (changing NS). Before I start talking to them on this issue, I want to know to whom I should talk to? Registrar or my host? Who’s on the fault? Thanks
If your domain name still resolves to the correct IP then your registrar is fine and you should talk to your host.
You can use ping $DOMAINNAME to see if the domain name resolves to the IP.