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Reverse DNS (Domain Name Method) lookup, also identified by the acronym (rDNS), is the procedure by which somebody can appear up a host name offered a distinct IP address. Reverse DNS is also recognized in some locations as reverse resolving. It is the opposite of DNS lookup, by which someone looks up an IP address provided a distinct host name.
Why use Reverse DNS?
A reverse DNS lookup is usually performed for troubleshooting purposes. Frequently, tools like a traceroute or a ping will do a reverse DNS lookup to figure out the flow of traffic from 1 point to another. An additional widespread location for reverse DNS lookup is when accessing a persons email. Several modern e-mail providers will do reverse DNS lookups to decide 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 amongst the owner of a server and the owner of a domain name. This technique, identified as Forward Confirmed reverse DNS (FCrDNS) is employed to place a quit to phishing internet sites and spammers.
What is IPv4 Reverse DNS lookup?
IPv4 Reverse DNS is a kind of reverse DNS that uses 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 example, if a particular 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 sort of reverse DNS that makes use of the particular domain ip6.arpa. As opposed to IPv4 Reverse DNS lookup, IPv6 Reverse DNS lookup does not use the common IP address style of hunting up host names. As an alternative, it uses a sequence of nibbles, or 4 bit aggregations, in reverse order with each and every quantity separated by a period. For example, if a particular person was performing a reverse domain lookup for an address such as 2001:0db8:::::1428:57ab he would do the lookup employing b.a.7.five.8.two.4.1.....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 in a position to figure out all of the host names linked with a certain IP address, although this practice is at times frowned upon. Numerous cheap internet hosting plans will provide shared virtual hosts where many sites share space on the identical IP address. Although this does not affect the validity of the info returned by a reverse DNS lookup, it can lead to problems with other services. broadwater hearing care st. petersburg fl
