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  • Reverse DNS?

    What does a "reverse DNS request" mean? And what does it do on a VPS server?

  • #2
    A reverse DNS request is the same on a VPS as it is on a regular server. A VPS is a Virtual Private Server. Being it acts just like a normal server there is no difference if a reverse lookup is done. When you do a reverse lookup you resolve and ip to a hostname the opposite when you do a forward lookup. Anytime you go to a website you do a forward lookup reverse is the opposite. Tons of email servers block servers that do not have a reverse entry like other people previously said. This is basically because of spammers.

    Regards,
    Dexter

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    • #3
      Hey Nikhil,

      A reverse DNS lookup is a DNS query for the domain name associated with a given IP address. This accomplishes the opposite of the more commonly used forward DNS lookup, in which the DNS system is queried to return an IP address.
      Reverse DNS is mainly used to track the origin of a website visitor, the origin of an e-mail message, etc. It is usually not as critical as the classic DNS, visitors will reach the website even without the presence of reverse DNS for the IP of the webserver or the IP of the visitor.


      Regards,
      Mrudul.

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      • #4
        A reverse DNS lookup is a DNS query for the domain name associated with a given IP address. This accomplishes the opposite of the more commonly used forward DNS lookup, in which the DNS system is queried to return an IP address.

        There are many security measures that your domain needs to pass in order for your emails to reach your clients' inboxes. Reverse DNS is the biggest deliverability killer, as almost all mail servers use this method to verify incoming domains.

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        • #5
          A reverse domain name system (DNS) lookup, or reverse IP lookup, is the opposite sequence of a DNS lookup. With a standard DNS lookup, you query the DNS server or hostname to get the IP address. But with the reverse DNS lookup command, you query the IP address to find the hostname. Therefore, by entering the IP address into the reverse lookup tool, users can locate the domain name associated with the corresponding IP.

          For example, one IP address of Google.com is 74.125.142.147. Typing this IP address into the reverse DNS lookup tool returns the host name of Google as listed in the database of the Address and Routing Parameter Area’s (ARPA) top-level domain of the Internet.

          Note that some IP addresses will not return a domain name. There may be records indicating multiple domain names for a given IP address in these cases. Web hosting, where one IP address of the server is shared among one or more domains, is a common example.


          How does reverse DNS lookup work?


          A reverse DNS lookup searches query DNS servers for PTR records, or pointer records. A PTR record maps an IP address to the hostname, so if there is no PTR record on the server, a reverse DNS record lookup won’t work.

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