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  2. Reverse DNS lookup - Wikipedia

    en.wikipedia.org/wiki/Reverse_DNS_lookup

    Reverse DNS lookups for IPv4 addresses use the special domain in-addr.arpa.In this domain, an IPv4 address is represented as a concatenated sequence of four decimal numbers, separated by dots, to which is appended the second level domain suffix .in-addr.arpa.

  3. BeenVerified - Wikipedia

    en.wikipedia.org/wiki/BeenVerified

    BeenVerified is a background check company that provides consumer initiated criminal background and people search services through its website for profit as well as its mobile application "Background Check App." [4] [5] The company also launched additional mobile applications including a reverse number look up called NumberGuru [6] and a registered sex offender tracking app that uses augmented ...

  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. Applications of reverse lookup include reverse DNS lookup, which provides the domain name associated with a particular IP address, reverse telephone directory, which provides the name of the entity associated with a particular telephone number,

  5. Lookup table - Wikipedia

    en.wikipedia.org/wiki/Lookup_table

    In computer science, a lookup table (LUT) is an array that replaces runtime computation with a simpler array indexing operation, in a process termed as direct addressing.The savings in processing time can be significant, because retrieving a value from memory is often faster than carrying out an "expensive" computation or input/output operation. [1]

  6. List of country calling codes - Wikipedia

    en.wikipedia.org/wiki/List_of_country_calling_codes

    Worldwide distribution of country calling codes. Regions are coloured by first digit. Country calling codes, country dial-in codes, international subscriber dialing (ISD) codes, or most commonly, telephone country codes are telephone number prefixes for reaching telephone subscribers in foreign countries or areas via international telecommunication networks.

  7. Telephone number mapping - Wikipedia

    en.wikipedia.org/wiki/Telephone_number_mapping

    One way of doing call forwarding with ENUM is illustrated in the next figure. The caller uses the telephone to dial the number of another subscriber, which leads to an ENUM lookup (such as is provided by SIP Broker). The DNS responds to the caller by returning a list with NAPTR records for VoIP communication, telephone numbers and email addresses.

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