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2. Reverse DNS lookup - Wikipedia

   en.wikipedia.org/wiki/Reverse_DNS_lookup

   In computer networks, a reverse DNS lookup or reverse DNS resolution (rDNS) is the querying technique of the Domain Name System (DNS) to determine the domain name associated with an IP address – the reverse of the usual "forward" DNS lookup of an IP address from a domain name. [1]

3. Domain name registry - Wikipedia

   en.wikipedia.org/wiki/Domain_name_registry

   A domain name registry is a database of all domain names and the associated registrant information in the top level domains of the Domain Name System (DNS) of the Internet that enables third party entities to request administrative control of a domain name. Most registries operate on the top-level and second-level of the DNS.

4. WHOIS - Wikipedia

   en.wikipedia.org/wiki/WHOIS

   This grace period is provided after a domain name registration period expires and is extended (renewed) automatically by the registry. If the registrar deletes the domain name during this period, the registry provides a credit to the registrar for the cost of the renewal. inactive: This status code indicates that delegation information (name ...

5. Domain Name System - Wikipedia

   en.wikipedia.org/wiki/Domain_Name_System

   The domain name space consists of a tree data structure. Each node or leaf in the tree has a label and zero or more resource records (RR), which hold information associated with the domain name. The domain name itself consists of the label, concatenated with the name of its parent node on the right, separated by a dot. [24]

6. Public Suffix List - Wikipedia

   en.wikipedia.org/wiki/Public_Suffix_List

   The Public Suffix List is intended to enumerate all domain suffixes controlled by registrars, as well as those controlled privately such as github.io. [8] An internet site consists of the online resources which can be controlled by the registrant of a domain name. That includes resources available via the domain and all its sub-domains.

7. Domain name - Wikipedia

   en.wikipedia.org/wiki/Domain_name

   An annotated example of a domain name. In the Internet, a domain name is a string that identifies a realm of administrative autonomy, authority or control. Domain names are often used to identify services provided through the Internet, such as websites, email services and more. Domain names are used in various networking contexts and for ...