You can set reverse records for IPv4 and IPv6 addresses that are assigned to your virtual or dedicated server. These records can be set within the customer administration – you can assign a domain name to the IP address (for example server.yourdomain.tld).
It is possible to assign several reverse records for each IP address.
A reverse entry can be any fully qualified domain name with an existing TLD. IDN domains can also be used (entered in the original format, not in Punycode).
Setting a Reverse Record
You can set reverse records by following the below procedure:
- Log in to the customer administration
- Open the server hosting tab
- Open the detail of the particular service
- Use the Reverse(PTR) Records IPv4 or Reverse(PTR) Records IPv6 links within the left menu.
For IPv4, select the specific IP address assigned to your server from the drop-down system and enter the record value.
For IPv6, fill in the last part of the IP address and enter a record value.
You can gradually insert several records for one IP address.
It is also possible to edit a reverse record by clicking on the icon for editing, saving and overwriting values within the list. Records can be deleted by clicking on the cross icon.
Any changes will take effect within 1 hour.
Reverse Records for Mail Servers
If you are using your virtual or dedicated server for sending e-mails, you have to set correct reverse records. By using them, mail servers partially validate the “identity” of your server.
When you are trying to deliver an e-mail to some server, the recipient performs the following checks:
- finding a PTR record for the IP address of your server (for example, translating 18.104.22.168 -> mail.example.com)
- the detected name is translated again to the IP address – ie the A record for the relevant domain (mail.example.com -> 22.214.171.124)
- if the original and detected IP addresses match, it’s okay
- if they do not match, the e-mail could be rejected
What is all this good for? The recipient thus verifies that the name is not forged in the reverse record.You can theoretically write any domain in the reverse record without having anything to do with it. The reverse translation of the name to an IP address, however, can only be set by the owner of the domain. This will verify that the name of the sending server is authentic.
An Example of the Correct Settings of a Reverse Record
Let’s have a virtual server with an IP address of 126.96.36.199, your domain is example.com and the name of the server is “mail.example.com“
- In the virtual server administration, set the reverse record for this IP address to “mail.example.com”
- In the DNS records administration of example.com, add an A record for the “mail” subdomain with a value of “188.8.131.52”.