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| − | Reverse DNS (Domain Name Program) lookup, also identified by the acronym (rDNS), is the procedure by which an individual can look up a host name given a specific IP address. Reverse DNS is also identified in some places as reverse resolving. It is the opposite of DNS lookup, by which somebody looks up an IP address given a particular host name.<br><br>Why use Reverse DNS?<br><br>A reverse DNS lookup is generally performed for troubleshooting purposes. Frequently, tools like a traceroute or a ping will do a reverse DNS lookup to determine the flow of site visitors from one point to one more. Yet another common location for reverse DNS lookup is when accessing a persons e-mail. Several modern e-mail providers will do reverse DNS lookups to determine if an e mail was sent from a recognized spam address. Ultimately, reverse [http://www.oconnorscatholicsupply.com/church-supplies-oil-stock-c-2_602.html oil stock] DNS can be employed to make confident that there is a proper relationship [http://www.oconnorscatholicsupply.com/vestments-surplice-c-2_90_472.html tour surplice] among the owner of a server and the owner of a domain name. This strategy, known as Forward Confirmed reverse DNS (FCrDNS) is employed to place a stop to phishing sites and spammers.<br><br>What is IPv4 Reverse DNS lookup?<br><br>IPv4 Reverse DNS is a type of reverse DNS that uses a reverse IN-ADDR entry with the special domain in-addr.arpa. The IP address represented [http://www.oconnorscatholicsupply.com/first-commuinion-first-communion-cards-c-3_412_415.html a guide to first communion] 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 utilizing 1.1.168.192.in-addr.arpa.<br><br>What is IPv6 Reverse DNS lookup?<br><br>IPv6 Reverse DNS lookup is a type of reverse DNS that uses the unique domain ip6.arpa. In contrast to IPv4 Reverse DNS lookup, IPv6 Reverse DNS lookup does not use the regular IP address style of searching up host names. Instead, it makes use of a sequence of nibbles, or 4 bit aggregations, in reverse order with every single quantity separated by a period. For example, if a person 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.....8.b.d..1...2.ip6.arpa.<br><br>What takes place when there are many host names assigned to one particular IP address?<br><br>A reverse DNS lookup will be able to determine all of the host names linked with a particular IP address, though this practice is occasionally frowned upon. Numerous cheap web hosting plans will supply shared virtual hosts exactly where many websites share space on the identical IP address. Although this does not have an effect on the validity of the data returned by a reverse DNS lookup, it can lead to troubles with other services.
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Версия 03:20, 27 декабря 2025
