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Reverse DNS (Domain Name Program) lookup, also recognized by the acronym (rDNS), is the approach by which someone can appear up a host name given a specific IP address. Reverse DNS is also recognized in some locations as reverse resolving. It is the opposite of DNS lookup, by which a person looks up an IP address given a certain host name. Why use Reverse DNS? A reverse DNS lookup is normally performed for troubleshooting purposes. Generally, tools like a traceroute or a ping will do a reverse DNS lookup to determine the flow of site visitors from one point to another. Yet another common spot for reverse DNS lookup is when accessing a persons e-mail. Numerous contemporary e-mail providers will do reverse DNS lookups to decide if an e-mail was sent from a recognized spam address. Finally, reverse DNS can be used to make confident that there is a appropriate relationship between the owner of a server and the owner of a domain name. This strategy, identified as Forward Confirmed reverse DNS (FCrDNS) is utilised to put a cease to phishing internet sites and spammers. What is IPv4 Reverse DNS lookup? san diego sheriff warrant IPv4 Reverse DNS is a type of reverse DNS that uses a reverse IN-ADDR entry with the particular 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 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 kind of reverse DNS that makes use of the special domain ip6.arpa. In contrast to IPv4 Reverse DNS lookup, IPv6 Reverse DNS lookup does not use the standard IP address style of hunting up host names. Rather, it uses a sequence of nibbles, or 4 bit aggregations, in reverse order with every single number separated by a period. For instance, if a person was performing a reverse domain lookup for an address such as 2001:0db8:::::1428:57ab he would do the lookup using b.a.7.5.8.two.4.1.....8.b.d..1...2.ip6.arpa. look into criminal attorney san diego What takes place when there are several host names assigned to one particular IP address? A reverse DNS lookup will be able to determine all of the host names related with a specific IP address, though this practice is often frowned upon. A lot of low-cost net hosting plans will offer you shared virtual hosts where many websites share space on the identical IP address. Even though this does not influence the validity of the details returned by a reverse DNS lookup, it can lead to problems with other services.