What is Reverse DNS?
Reverse DNS (Domain Name Technique) lookup, also known by the acronym (rDNS), is the method by which somebody can look up a host name given a certain IP address. Reverse DNS is also recognized in some areas as reverse resolving. It is the opposite of DNS lookup, by which somebody looks up an IP address offered a distinct host name.
Why use Reverse DNS?
A reverse DNS lookup is normally performed for troubleshooting purposes. Commonly, tools like a traceroute or a ping will do a reverse DNS lookup to determine the flow of visitors from a single point to one more. Another common place for reverse DNS lookup is when accessing a persons e mail. Several contemporary e mail providers will do reverse DNS lookups to determine if an e mail was sent from an identified spam address. Lastly, reverse DNS can be employed to make positive that there is an appropriate connection in between the owner of a server and the owner of a domain name. This technique, recognized as Forward Confirmed reverse DNS (FCrDNS) is utilised to put a stop to phishing websites and spammers.
What is IPv4 Reverse DNS lookup?
IPv4 Reverse DNS is a sort of reverse DNS that utilizes a reverse IN-ADDR entry with the unique domain in-addr.arpa. The IP address represented in the in-addr.arpa domain is written in reverse order to the usual way that the IP address is written. For instance, if a person was performing a reverse domain lookup for an address such as 192.168.1.1, he would do the lookup using 1.1.168.192.in-addr.arpa.
What is IPv6 Reverse DNS lookup?
IPv6 Reverse DNS lookup is a form of reverse DNS that utilizes the unique domain ip6.arpa. As opposed to IPv4 Reverse DNS lookup, IPv6 Reverse DNS lookup does not use the regular IP address style of searching up host names. As an alternative, it makes use of a sequence of nibbles, or four bit aggregations, in reverse order with each and every number separated by a period. For example, if an individual was performing a reverse domain lookup for an address such as 2001:0db8:::::1428:57ab he would do the lookup using b.a.7.5.eight.2.four.1…..8.b.d..1…2.ip6.arpa.
What takes place when there are numerous host names assigned to one particular IP address?
A reverse DNS lookup will be able to establish all of the host names linked with a particular IP address, although this practice is sometimes frowned upon. Several low cost web hosting plans will provide shared virtual hosts exactly where many internet sites share space on the same IP address. Though this does not impact the validity of the information returned by a reverse DNS lookup, it can lead to problems with other solutions.
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