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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. WHOIS - Wikipedia

    en.wikipedia.org/wiki/WHOIS

    Lookups of IP address allocations are often limited to the larger Classless Inter-Domain Routing (CIDR) blocks (e.g., /24, /22, /16), because usually only the regional Internet registries (RIRs) and domain registrars run RWhois or WHOIS servers, although RWhois is intended to be run by even smaller local Internet registries, to provide more ...

  4. Reverse DNS lookup - Wikipedia

    en.wikipedia.org/wiki/Reverse_DNS_lookup

    Some anti-spam filters assume that email that originates from such addresses is likely to be spam, and may refuse connection. [6] [7] A forward-confirmed reverse DNS (FCrDNS) verification can create a form of authentication showing a valid relationship between the owner of a domain name and the owner of the server that has been given an IP address.

  5. List of assigned /8 IPv4 address blocks - Wikipedia

    en.wikipedia.org/.../8_IPv4_address_blocks

    Starting 1991-06-01, was used to map Public Data Network addresses to IP addresses. Returned to IANA 2008-01-22. This network was reclaimed by IANA in 2007 and was subsequently re-allocated in 2010. See RFC 877 and RFC 1356 for historical information. [10] 15.0.0.0/8 ARIN: 1991-09

  6. Wikipedia:CheckUser - Wikipedia

    en.wikipedia.org/wiki/Wikipedia:CheckUser

    Logo for the Wikipedia CheckUser tool and the checkuser team. The CheckUser tool is used by a small group of trusted Wikipedia users (called checkusers).The tool allows its users to determine from Wikipedia's servers the IP addresses used by a Wikipedia user account, as well as other technical data stored by the server about a user account or IP address.

  7. 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.

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