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2. 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 ...

3. Reverse DNS lookup - Wikipedia

   en.wikipedia.org/wiki/Reverse_DNS_lookup

   It is important to note that this is the reverse order to the usual dotted-decimal convention for writing IPv4 addresses in textual form. 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.

4. Namecheap - Wikipedia

   en.wikipedia.org/wiki/Namecheap

   Namecheap is an American ICANN-accredited domain name registrar [1] and web hosting company, based in Phoenix, Arizona. The company was founded in 2000 by Richard Kirkendall [ 2 ] and has since grown to become one of the largest independent domain registrars in the world, with over 10 million customers and over 17 million domains under management.

5. Top-level domain - Wikipedia

   en.wikipedia.org/wiki/Top-level_domain

   However, after it had been used for reverse DNS lookup, it was found impractical to retire it, and is used today exclusively for Internet infrastructure purposes such as in-addr.arpa for IPv4 and ip6.arpa for IPv6 reverse DNS resolution, uri.arpa and urn.arpa for the Dynamic Delegation Discovery System, and e164.arpa for telephone number ...

6. Wildcard DNS record - Wikipedia

   en.wikipedia.org/wiki/Wildcard_DNS_record

   So, a lookup for the MX record for somerandomname.example.com would return an MX record pointing to host1.example.com. Wildcards in the DNS are much more limited than other wildcard characters used in other computer systems. Wildcard DNS records have a single * (asterisk) as the leftmost DNS label, such as *.example.com.

7. NAPTR record - Wikipedia

   en.wikipedia.org/wiki/NAPTR_record

   A Name Authority Pointer (NAPTR) is a type of resource record in the Domain Name System of the Internet. [1] [2]NAPTR records are most commonly used for applications in Internet telephony, for example, in the mapping of servers and user addresses in the Session Initiation Protocol (SIP).