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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. Comparison of cross-platform instant messaging clients

    en.wikipedia.org/wiki/Comparison_of_cross...

    Examples of such messaging services include: Skype, Facebook Messenger, Google Hangouts (subsequently Google Chat), Telegram, ICQ, Element, Slack, Discord, etc. Users have more options as usernames or email addresses can be used as user identifiers, besides phone numbers. Unlike the phone-based model, user accounts on a multi-device model are ...

  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. [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 ...

  5. 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 ...

  6. List of IP protocol numbers - Wikipedia

    en.wikipedia.org/wiki/List_of_IP_protocol_numbers

    This is a list of the IP protocol numbers found in the field Protocol of the IPv4 header and the Next Header field of the IPv6 header. It is an identifier for the encapsulated protocol and determines the layout of the data that immediately follows the header.

  7. List of TCP and UDP port numbers - Wikipedia

    en.wikipedia.org/wiki/List_of_TCP_and_UDP_port...

    Despite this port being assigned by IANA, the service is meant to work on SPP (ancestor of IPX/SPX), instead of TCP/IP. [36] 53: Yes: Domain Name System (DNS) [37] [11] 54: Assigned: Xerox Network Systems (XNS) Clearinghouse (Name Server). Despite this port being assigned by IANA, the service is meant to work on SPP (ancestor of IPX/SPX ...

  8. Ip address lookup - Wikipedia

    en.wikipedia.org/?title=Ip_address_lookup&...

    This page was last edited on 9 June 2015, at 23:20 (UTC).; Text is available under the Creative Commons Attribution-ShareAlike 4.0 License; additional terms may apply ...

  9. Discord - Wikipedia

    en.wikipedia.org/wiki/Discord

    Discord is an instant messaging and VoIP social platform which allows communication through voice calls, video calls, text messaging, and media.Communication can be private or take place in virtual communities called "servers".