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When you query the Domain Name System (DNS) to determine the domain name associated with an IP address, that is called a Reverse DNS lookup or reverse DNS resolution (rDNS). It is called a “reverse” lookup because it is the reverse of the usual DNS lookup, which is used to determine the IP address associated with a domain name.

DNS lookup: domain = IP
rDNS lookup: IP = domain

Having reverse DNS entries in place is best practice, but it has become especially important for services like email since many mail servers will not accept messages from IP addresses without reverse DNS entries.

To set the reverse DNS records for your GreenGeeks VPS, log in to your GreenGeeks Account Manager and in the “Quick Server Login” section, click the “View Details” button.

GreenGeeks dashboard VPS view details button

Click “Manage RDNS.”

GreenGeeks dashboard VPS manage RDNS step 1

Click the “Hostname” link to configure reverse DNS.

GreenGeeks dashboard VPS manage RDNS step 2

Enter your primary VPS hostname (e.g., vps.ggexample.com) in both fields. Click the green checkbox to save.

GreenGeeks dashboard VPS manage RDNS step 3

DNS changes take a bit of time to propagate throughout the internet, and that period varies depending on a number of factors. Typically though, DNS changes shouldn’t take more than a few hours to propagate.

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