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2. Reverse 911 - Wikipedia

   en.wikipedia.org/wiki/Reverse_911

   In October 2014, some Dallas, Texas, residents were notified of the city's second Ebola infection case by a Reverse 911 call. [10] In 2023, residents of East Nantmeal Township and South Coventry Township, Pennsylvania, received late-night reverse 911 calls to lock their doors and stay inside during the search for escaped murderer Danilo ...

3. Reverse search warrant - Wikipedia

   en.wikipedia.org/wiki/Reverse_search_warrant

   A reverse search warrant is a type of search warrant used in the United States, in which law enforcement obtains a court order for information from technology companies to identify a group of people who may be suspects in a crime. They differ from traditional search warrants, which typically apply to specific individuals.

4. .arpa - Wikipedia

   en.wikipedia.org/wiki/.arpa

   Prominent among such functions are the subdomains in-addr.arpa and ip6.arpa, which provide namespaces for reverse DNS lookup of IPv4 and IPv6 addresses, respectively. The name originally was the acronym for the Advanced Research Projects Agency (ARPA), the funding organization in the United States that developed the ARPANET , the precursor of ...

5. Forward-confirmed reverse DNS - Wikipedia

   en.wikipedia.org/wiki/Forward-confirmed_reverse_DNS

   Forward-confirmed reverse DNS (FCrDNS), also known as full-circle reverse DNS, double-reverse DNS, or iprev, is a networking parameter configuration in which a given IP address has both forward (name-to-address) and reverse (address-to-name) Domain Name System (DNS) entries that match each other. This is the standard configuration expected by ...

6. Reverse Address Resolution Protocol - Wikipedia

   en.wikipedia.org/wiki/Reverse_Address_Resolution...

   The Reverse Address Resolution Protocol (RARP) is an obsolete computer communication protocol used by a client computer to request its Internet Protocol address from a computer network, when all it has available is its link layer or hardware address, such as a MAC address. The client broadcasts the request and does not need prior knowledge of ...

7. 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 ...