Why Is Reverse DNS Used?

A special PTR-record type is used to store reverse DNS entries.

The name of the PTR-record is the IP address with the segments reversed + “.in-addr.arpa”.

Reverse DNS is also different from forward DNS in who points the zone (domain name) to your DNS server.

What is the purpose of reverse DNS?

Reverse DNS (rDNS) is a method of resolving an IP address into a domain name, just as the domain name system (DNS) resolves domain names into associated IP addresses. One of the applications of reverse DNS is as a spam filter.

What is the purpose of reverse lookup zone?

WINS Reverse Lookup Records

Reverse lookup zones are used to resolve IP addresses to host names, rather than host names to IP addresses, as is the case with forward lookup zones.

What is reverse mapping?

Reverse Mapping. The DNS database also includes zone files that use the IP address as a key to find the host name of the machine, enabling IP address to host name resolution. This process is called reverse resolution or more commonly, reverse mapping.

How do I do a reverse DNS lookup?

Intellect Connect

  • To test Reverse DNS, we’ll use the command prompt:
  • Type “cmd” to bring up the command prompt.
  • For a standard DNS query, type “nslookup www.google.com” in the command prompt (note, any domain name can replace www.google.com).

What is a PTR record and why do I care?

The purpose of a PTR record is mostly administrative – it shows an IP is in fact used with a particular domain. SiteGround provides PTR records only on Cloud and Dedicated servers.

Why PTR record is created in DNS?

A PTR record is therefore sometimes called Reverse DNS Record because it converts an IP address into a name. A PTR record can only be created on the nameservers managed by the owner of the IP address, and is only valid for static IP addresses.

Do I need a PTR record?

There should be exactly one PTR record per IP address/name pair. Each IP address should have a PTR record. The convention is, that name’s IP address must have a PTR record that resolves back to the name used in the MX record. There should be an A record for every PTR record (but not necessarily vice versa).

What is a reverse IP lookup?

What is a Reverse IP Lookup? The technique known as Reverse IP Lookup is a way to identify hostnames that have DNS (A) records associated with an IP address. A web server can be configured to server multiple virtual hosts from a single IP address. This is a common technique in shared hosting environments.

Do you need reverse lookup zone DNS?

You need reverse DNS to match IP Addresses to Host Names. You don’t need to set up another DNS server for reverse lookup, your existing DNS server should be configured to do it – i.e. if it doesn’t exist, create a Reverse Lookup Zone.