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2. Reverse DNS lookup - Wikipedia

   en.wikipedia.org/wiki/Reverse_DNS_lookup

   For example, to do a reverse lookup of the IP address 8.8.4.4 the PTR record for the domain name 4.4.8.8.in-addr.arpa would be looked up, and found to point to dns.google. If the A record for dns.google in turn pointed back to 8.8.4.4 then it would be said to be forward-confirmed .

3. How to Do a Free Reverse Phone Lookup & the 8 Best ... - AOL

   www.aol.com/finance/free-reverse-phone-lookup-8...

   Spy Dialer is a free reverse phone lookup service that accesses public databases of registered phone numbers to help users find information on cell phone and landline numbers and emails.

4. Reverse lookup - Wikipedia

   en.wikipedia.org/wiki/Reverse_lookup

   Reverse lookup is a procedure of using a value to retrieve a unique key in an associative array. [1] Applications of reverse lookup include reverse DNS lookup, which provides the domain name associated with a particular IP address, [2] reverse telephone directory, which provides the name of the entity associated with a particular telephone ...

5. Domain Name System - Wikipedia

   en.wikipedia.org/wiki/Domain_Name_System

   For IPv6, the reverse lookup domain is ip6.arpa. The IP address is represented as a name in reverse-ordered octet representation for IPv4, and reverse-ordered nibble representation for IPv6. When performing a reverse lookup, the DNS client converts the address into these formats before querying the name for a PTR record following the delegation ...

6. American Registry for Internet Numbers - Wikipedia

   en.wikipedia.org/wiki/American_Registry_for...

   The American Registry for Internet Numbers (ARIN) is the regional Internet registry for the United States, Canada, and many Caribbean and North Atlantic islands. ARIN manages the distribution of Internet number resources, including IPv4 and IPv6 address space and AS numbers .

7. IPv6 - Wikipedia

   en.wikipedia.org/wiki/IPv6

   Such a dual-stack DNS server holds IPv4 addresses in the A records and IPv6 addresses in the AAAA records. Depending on the destination that is to be resolved, a DNS name server may return an IPv4 or IPv6 IP address, or both. A default address selection mechanism, or preferred protocol, needs to be configured either on hosts or the DNS server.