Setting up Reverse DNS (RDNS) PTR records for VPS or Dedicated servers
DNS provides a way to map a server name to an IP address e.g. www.krystal.uk = 220.127.116.11
It also provides, via Reverse DNS (RDNS), a way to do the reverse check, from an IP address to a server name via PTR records.
This can be particularly important if you are running an email server. Remote mail servers will often perform an RDNS lookup to ensure that the IP address the request came from matches the domain name of the incoming email. If you don't have RDNS setup your email may not be accepted.
RDNS PTR records can be requested by contacting Krystal Support.
Please provide details of the VPS/Dedicated server IP address and the fully qualified domain name of the server (FQDN) e.g. if you've named your VPS
server and your domain is
example.co.uk then your FQDN would be