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  2. ping (networking utility) - Wikipedia

    en.wikipedia.org/wiki/Ping_(networking_utility)

    Ping measures the round-trip time for messages sent from the originating host to a destination computer that are echoed back to the source. The name comes from active sonar terminology that sends a pulse of sound and listens for the echo to detect objects under water. [1] Ping operates by means of Internet Control Message Protocol (ICMP) packets.

  3. PathPing - Wikipedia

    en.wikipedia.org/wiki/PathPing

    The advantages of PathPing over ping and traceroute are that each node is pinged as the result of a single command, and that the behavior of nodes is studied over an extended time period, rather than the default ping sample of four messages or default traceroute single route trace. The disadvantage is that it takes a total of 25 seconds per hop ...

  4. Google Public DNS - Wikipedia

    en.wikipedia.org/wiki/Google_Public_DNS

    Google Public DNS is a Domain Name System (DNS) service offered to Internet users worldwide by Google.It functions as a recursive name server.Google Public DNS was announced on December 3, 2009, [1] in an effort described as "making the web faster and more secure."

  5. 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]

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

    en.wikipedia.org/wiki/List_of_assigned_/8_IPv4...

    Some large / 8 blocks of IPv4 addresses, the former Class A network blocks, are assigned in whole to single organizations or related groups of organizations, either by the Internet Corporation for Assigned Names and Numbers (ICANN), through the Internet Assigned Numbers Authority (IANA), or a regional Internet registry.

  7. Internet Control Message Protocol - Wikipedia

    en.wikipedia.org/wiki/Internet_Control_Message...

    The ICMP header starts after the IPv4 header and is identified by its protocol number, 1. [6] All ICMP packets have an eight-byte header and variable-sized data section. The first four bytes of the header have fixed format, while the last four bytes depend on the type and code of the ICMP packet.

  8. 1.1.1.1 - Wikipedia

    en.wikipedia.org/wiki/1.1.1.1

    1.1.1.1 is a free Domain Name System (DNS) service by the American company Cloudflare in partnership with APNIC. [7] [needs update] The service functions as a recursive name server, providing domain name resolution for any host on the Internet.

  9. Quad9 - Wikipedia

    en.wikipedia.org/wiki/Quad9

    Quad9 is a global public recursive DNS resolver that aims to protect users from malware and phishing.Quad9 is operated by the Quad9 Foundation, a Swiss public-benefit, not-for-profit foundation with the purpose of improving the privacy and cybersecurity of Internet users, headquartered in Zürich. [1]