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started by Sandy Jarvis on 08 Mar 12
started by Sandy Jarvis on 08 Mar 12
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Reverse DNS (Domain Name Program) lookup, also identified by the acronym (rDNS), is the approach by which someone can look up a host name offered a particular IP address. Reverse DNS is also recognized in some places as reverse resolving. It is the opposite of DNS lookup, by which a person looks up an IP address offered a distinct host name.
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Why use Reverse DNS?
A reverse DNS lookup is typically performed for troubleshooting purposes. Commonly, tools like a traceroute or a ping will do a reverse DNS lookup to figure out the flow of traffic from a single point to yet another. Yet another common location for reverse DNS lookup is when accessing a persons e-mail. Several modern day e-mail providers will do reverse DNS lookups to establish if an email was sent from a known spam address. Ultimately, reverse DNS can be utilised to make sure that there is a appropriate relationship among the owner of a server and the owner of a domain name. This technique, recognized as Forward Confirmed reverse DNS (FCrDNS) is used to place a cease to phishing web sites and spammers.
What is IPv4 Reverse DNS lookup?
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IPv4 Reverse DNS is a form of reverse DNS that utilizes a reverse IN-ADDR entry with the special 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 individual 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 type of reverse DNS that uses the unique domain ip6.arpa. As opposed to IPv4 Reverse DNS lookup, IPv6 Reverse DNS lookup does not use the standard IP address style of looking up host names. Instead, it makes use of a sequence of nibbles, or 4 bit aggregations, in reverse order with each number separated by a period. For instance, if a individual was performing a reverse domain lookup for an address such as 2001:0db8:::::1428:57ab he would do the lookup utilizing b.a.7.5.8.two.four.1.....eight.b.d..1...two.ip6.arpa.
What takes place when there are several host names assigned to one particular IP address?
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A reverse DNS lookup will be in a position to determine all of the host names connected with a certain IP address, even though this practice is often frowned upon. Several low-cost web hosting plans will supply shared virtual hosts where many internet sites share space on the identical IP address. Although this does not influence the validity of the data returned by a reverse DNS lookup, it can lead to troubles with other services.