What is rDNS?

Reverse DNS (rDNS) is the process of resolving an IP address to a domain name, the opposite of the standard DNS lookup. In a regular DNS query, a domain name is translated into an IP address. However, with rDNS, the system identifies which domain name is associated with a specific IP address.

rDNS is primarily used for verification and security purposes. It helps validate the origin of emails to reduce spam by confirming that the sender’s IP address matches a legitimate domain name. Many mail servers reject or flag emails from servers without proper rDNS configuration.

rDNS records are stored as PTR (Pointer) records in the DNS database. Unlike forward DNS, rDNS queries use a special domain called in-addr.arpa, where the IP address is reversed and appended with this domain for lookup.

Setting up rDNS requires administrative access to the DNS records of the IP address block. It is typically managed by the IP block owner or provider through cooperation with the relevant Regional Internet Registry (RIR), such as RIPE for Europe.

Although rDNS is not essential for most internet services, it plays a key role in improving trust and reducing network abuse.

You can make a rDNS Request to the leased IP-Block to connect rDNS.