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  2. Google Public DNS - Wikipedia

    en.wikipedia.org/wiki/Google_Public_DNS

    8.8.8.8 8.8.4.4 Via IPv6: ... Data) flag was not set in the launch version, meaning the server was unable to validate signatures for all of the data.

  3. Reverse DNS lookup - Wikipedia

    en.wikipedia.org/wiki/Reverse_DNS_lookup

    For example, to do a reverse lookup of the IP address 8.8.4.4 the PTR record for the domain name 4.4.8.8.in-addr.arpa would be looked up, and found to point to dns.google. If the A record for dns.google in turn pointed back to 8.8.4.4 then it would be said to be forward-confirmed.

  4. Public recursive name server - Wikipedia

    en.wikipedia.org/wiki/Public_recursive_name_server

    A public recursive name server (also called public DNS resolver) is a name server service that networked computers may use to query the Domain Name System (DNS), the decentralized Internet naming system, in place of (or in addition to) name servers operated by the local Internet service provider (ISP) to which the devices are connected.

  5. 0.0.0.0 - Wikipedia

    en.wikipedia.org/wiki/0.0.0.0

    IANA, who allocate IP addresses globally, have allocated the single IP address 0.0.0.0 [1] to RFC 1122 section 3.2.1.3. It is named as "This host on this network". RFC 1122 refers to 0.0.0.0 using the notation {0,0}.

  6. 2-8-8-4 - Wikipedia

    en.wikipedia.org/wiki/2-8-8-4

    Duluth, Missabe & Iron Range 2-8-8-4 "Yellowstone" No. 229, as preserved in 1987. A 2-8-8-4 steam locomotive, under the Whyte notation, has two leading wheels, two sets of eight driving wheels, and a four-wheel trailing truck.

  7. 2-8-8-8-8-2 - Wikipedia

    en.wikipedia.org/wiki/2-8-8-8-8-2

    Under the Whyte notation for the classification of steam locomotives, a 2-8-8-8-8-2 has two leading wheels, four sets of eight driving wheels, and two trailing wheels. Because of its length, such a locomotive must be an multiplex locomotive. It is longer than a normal articulated locomotive; the fourth set of drivers is located under the tender.

  8. IEEE 802.11ac-2013 - Wikipedia

    en.wikipedia.org/wiki/IEEE_802.11ac-2013

    IEEE 802.11ac-2013 or 802.11ac is a wireless networking standard in the IEEE 802.11 set of protocols (which is part of the Wi-Fi networking family), providing high-throughput wireless local area networks (WLANs) on the 5 GHz band.

  9. Electron shell - Wikipedia

    en.wikipedia.org/wiki/Electron_shell

    In chemistry and atomic physics, an electron shell may be thought of as an orbit that electrons follow around an atom's nucleus.The closest shell to the nucleus is called the "1 shell" (also called the "K shell"), followed by the "2 shell" (or "L shell"), then the "3 shell" (or "M shell"), and so on further and further from the nucleus.