For IPv4 and IPv6 addresses that are assigned to your virtual or dedicated server, you can set reverse records in the customer administration – assign a domain name to the IP address (for example server.yourdomain.tld).
For each IP address is possible to assign more reverse records.
As reverse record value can be used any fully qualified domain name with an existing TLD. Also is possible to use IDNdomains (entered in the original format, not in Punycode).
Setting of reverse record
You can set reverse records by the following procedure:
- Log on to the customer administration
- Open tab serverhosting
- Open the detail of particular service
- In left menu use link Reverse(PTR) Records IPv4 or Reverse(PTR) Records IPv6
In the case of IPv4 select a specific IP address (from the drop down menu) that was assigned to your server, and enter record value.
In the case of IPv6 write the last part of the IP address and enter and record value.
For one IP address, you can gradually insert more records.
In the list is also possible to edit a reverse record by clicking on the icon for editing, saving and overwriting values. Records are possible to delete by clicking on 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 e-mail to some server, the recipient performs the following checks:
- find a PTR record for the IP address of your server (for example, translates 188.8.131.52 -> mail.example.com)
- detected name again translates to the IP address – A record for the domain (mail.example.com -> 184.108.40.206)
- If the original and detected IP addresses match, it’s okay
- if they do not match, e-mail could be rejected
What is it good for? The recipient can verify that no spurious name in reverse record. Theoretically into the reverse record, you can type any domain. But the reverse translation of the name to IP address can be set only by the owner of the domain. This will verify that the name of the sending server is authentic.
Example of correct reverse record setting
Let’s have a virtual server with IP address 220.127.116.11, your domain is example.com and server name “mail.example.com“
- In the administration of virtual server, set PTR record for the IP address with “mail.example.com”
- In the administration of the DNS records for domain example.com, add A record for the subdomain “mail” with “18.104.22.168”.