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Reverse DNS (Domain Name Program) lookup, also recognized by the acronym (rDNS), is the procedure by which somebody can appear up a host name given a particular IP address. Reverse DNS is also known in some areas as reverse resolving. It is the opposite of DNS lookup, by which a person looks up an IP address given a specific 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 decide the flow of site visitors from 1 point to another. Yet another frequent place for reverse DNS lookup is when accessing a persons e mail. A lot of modern e-mail providers will do reverse DNS lookups to decide if an e-mail was sent from a identified spam address. Lastly, reverse DNS can be employed to make positive that there is a proper relationship between the owner of a server and the owner of a domain name. This approach, known as Forward Confirmed reverse DNS (FCrDNS) is employed to place a cease to phishing sites and spammers. What is IPv4 Reverse DNS lookup? look into criminal attorney san diego IPv4 Reverse DNS is a type of reverse DNS that makes use of 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 individual was performing a reverse domain lookup for an address such as 192.168.1.1, he would do the lookup making use of 1.1.168.192.in-addr.arpa. What is IPv6 Reverse DNS lookup? IPv6 Reverse DNS lookup is a type 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 common IP address style of hunting up host names. As an alternative, it makes use of a sequence of nibbles, or four 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 making use of b.a.7.five.8.two.four.1.....8.b.d..1...two.ip6.arpa. san diego criminal lawyer What occurs when there are multiple host names assigned to 1 IP address? A reverse DNS lookup will be in a position to establish all of the host names linked with a specific IP address, even though this practice is sometimes frowned upon. Several inexpensive net hosting plans will offer you shared virtual hosts where a lot of web sites share space on the same IP address. Even though this does not influence the validity of the details returned by a reverse DNS lookup, it can lead to difficulties with other services.