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Public Recursive Name Servers
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. Reasons for using these services include: * speed, compared to using ISP DNS services * filtering (security, ad-blocking, porn-blocking, etc.) * reporting * avoiding censorship * redundancy (smart caching) * access to unofficial alternative top level domains not found in the official DNS root zone *temporary unavailability of the ISP's name server Public DNS resolver operators often cite increased privacy as an advantage of their services; critics of public DNS services have cited the possibility of mass data collection targeted at the public resolvers as a potential risk of using these services. Several services now support secure DNS lookup trans ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Name Server
A name server refers to the server component of the Domain Name System (DNS), one of the two principal namespaces of the Internet. The most important function of DNS servers is the translation (resolution) of human-memorable domain names (example.com) and hostnames into the corresponding numeric Internet Protocol (IP) addresses (192.0.2.1), the second principal name space of the Internet, which is used to identify and locate computer systems and resources on the Internet. Although it is typically used in reference to DNS (Domain Name System), the term name server may also be used for any computer application that implements a network service for providing responses to queries against a directory service which translates an often humanly meaningful, text-based identifier to a system-internal, often numeric identification or addressing component. This service is performed by the server in response to a service protocol request. Domain Name Server The Internet maintains two princi ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
AdGuard
Developed by AdGuard Software Limited, AdGuard offers open-source, free, and shareware products. AdGuard's DNS app supports Microsoft Windows, Linux, macOS, Android and iOS. AdGuard is also available as a browser extension. AdGuard Software Limited was founded in 2009 in Moscow. In 2014 AdGuard Software Limited's products became available in Cyprus to where its headquarters were subsequently moved. Features AdGuard features include: AdGuard Home AdGuard Home acts as a recursive DNS resolver, which responds with an invalid address for domains that appear in its filter lists quests. It is similar to Pi-hole. AdGuard Browser extensions The browser extension blocks video ads, interstitial ads, floating ads, pop-ups, banners, and text ads. There is a possibility to handle anti-AdBlock scripts. The product also blocks spyware and warns users of malicious websites. AdGuard Content Blocker is an additional browser extension for browsers Yandex Browser and Samsung Inte ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Yandex
Yandex LLC (russian: link=no, Яндекс, p=ˈjandəks) is a Russian multinational technology company providing Internet-related products and services, including an Internet search engine, information services, e-commerce, transportation, maps and navigation, mobile applications, and online advertising. It primarily serves audiences in Russia and the Commonwealth of Independent States of the former Soviet Union, and has more than 30 offices worldwide. The firm is the largest technology company in Russia and the second largest search engine on the Internet in Russian, with a market share of over 42%. It also has the largest market share of any search engine from Europe and the Commonwealth of Independent States and is the 5th largest search engine worldwide after Google, Bing, Yahoo!, and Baidu. Its main competitors on the Russian market are Google, VK, and Rambler. Yandex LLC's holding company, Yandex N.V., is registered in Amsterdam, the Netherlands as a '' naamloze vennoots ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
EDNS Client Subnet
EDNS Client Subnet (ECS) is an option in the Extension Mechanisms for DNS that allows a recursive DNS resolver to specify the subnetwork for the host or client on whose behalf it is making a DNS query. This is generally intended to help speed up the delivery of data from content delivery networks, by allowing better use of DNS-based load balancing to select a service address near the client when the client computer is not necessarily near the recursive resolver. When an authoritative name server receives a DNS query, it takes advantage of ECS DNS extension to resolve the hostname to a CDN which is geolocationally near to the client IP's subnet, hence the client makes further requests to a nearby CDN, thereby reducing latency. The EDNS client subnet mechanism is specified in . Privacy and security implications Because ECS provides client network information to upstream resolver, the extension reveals some information about the client's location that the resolver would not other ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
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 Zurich. It is the only global public resolver which is operated not-for-profit, in the public benefit. Quad9 is entirely subject to Swiss privacy law, and the Swiss government extends that protection of the law to Quad9's users throughout the world, regardless of citizenship or country of residence. Security and privacy Several independent evaluations have found Quad9 to be the most effective (97%) at blocking malware and phishing domains. As of June, 2021, Quad9 was blocking more than 100 million malware infections and phishing attacks per day. Quad9's malware filtering is a user-selectable option. The domains which are filtered are not determined by Quad9, but instead supplied to Quad9 ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
OpenNIC
OpenNIC (also referred to as the OpenNIC Project) is a user-owned and -controlled top-level Domain name registry, Network Information Center that offers a non-national alternative to traditional top-level domain (TLD) Domain name registry, registries such as ICANN. As of January 2017, OpenNIC recognizes and peers all existing ICANN Top-level domain, TLDs, for compatibility reasons. However, OpenNIC has not yet evaluated and does not hold a formal position on Proposed top-level domain, future ICANN TLDs. In addition to resolving hostnames in the ICANN Root name server, root, OpenNIC also resolves hostnames in OpenNIC-operated namespaces, as well as within namespaces with which Peering, peering agreements have been established. Some OpenNIC recursive servers (Tier 2 servers) are known for their high speeds and low latency, relative to other more widely used DNS recursors, as well as their anonymizing or no-logging policies. Many servers offer DNSCrypt. Tier 2 servers are operated by c ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
OpenDNS
OpenDNS is an American company providing Domain Name System (DNS) resolution services—with features such as phishing protection, optional content filtering, and DNS lookup in its DNS servers—and a cloud computing security product suite, Umbrella, designed to protect enterprise customers from malware, botnets, phishing, and targeted online attacks. The OpenDNS Global Network processes an estimated 100 billion DNS queries daily from 85 million users through 25 data centers worldwide. On August 27, 2015, Cisco acquired OpenDNS for million in an all-cash transaction, plus retention-based incentives for OpenDNS. OpenDNS's business services were renamed Cisco Umbrella; home products retained the OpenDNS name. Cisco said that it intended to continue development of OpenDNS with its other cloud-based security products, and that it would continue its existing services. Until June , OpenDNS provided an ad-supported service and a paid advertisement-free service. The services are based ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
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, in an effort described as "making the web faster and more secure." As of 2018, it is the largest public DNS service in the world, handling over a trillion queries per day. Google Public DNS is not related to Google Cloud DNS, which is a DNS hosting service. Service The Google Public DNS service operates recursive name servers for public use at the following four IP addresses. The addresses are mapped to the nearest operational server by anycast routing. The service does not use conventional DNS name server software, such as BIND, instead relying on a custom-designed implementation, conforming to the DNS standards set forth by the IETF. It fully supports the DNSSEC protocol since 19 March 2013. Previously, Google Public DNS accepted and forwarded DNSSEC-formatted messages but did ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Dyn (company)
Dyn, Inc. () was an Internet performance management and web application security company, offering products to monitor, control, and optimize online infrastructure, and also domain registration services and email products. The company was acquired by Oracle Corporation in 2016, and has operated as a global business unit of Oracle after the acquisition completed in 2017. Some Dyn services are planned to be retired by Oracle on May 31, 2023. History Dyn was created as a community-led student project by Tim Wilde, who then hired Jeremy Hitchcock, Tom Daly and Chris Reinhardt during their undergraduate studies at Worcester Polytechnic Institute. Eventually Wilde brought in Hitchcock and Daly as partners. Dyn enabled students to access lab computers and print documents remotely. The project then moved towards Domain Name System (DNS) services. The first iteration was a free dynamic DNS service known as DynDNS. The project required $25,000 to stay open, and raised over $40,000. T ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
DNS64
An IPv6 transition mechanism is a technology that facilitates the transitioning of the Internet from the Internet Protocol version 4 (IPv4) infrastructure in use since 1983 to the successor addressing and routing system of Internet Protocol Version 6 (IPv6). As IPv4 and IPv6 networks are not directly interoperable, transition technologies are designed to permit hosts on either network type to communicate with any other host. To meet its technical criteria, IPv6 must have a straightforward transition plan from the current IPv4. The Internet Engineering Task Force (IETF) conducts working groups and discussions through the IETF Internet Drafts and Request for Comments processes to develop these transition technologies towards that goal. Some basic IPv6 transition mechanisms are defined in RFC 4213. Stateless IP/ICMP Translation Stateless IP/ ICMP Translation (SIIT) translates between the packet header formats in IPv6 and IPv4. The SIIT method defines a class of IPv6 addresses cal ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
NAT64
NAT64 is an IPv6 transition mechanism that facilitates communication between IPv6 and IPv4 hosts by using a form of network address translation (NAT). The NAT64 gateway is a translator between IPv4 and IPv6 protocols, for which function it needs at least one IPv4 address and an IPv6 network segment comprising a 32-bit address space. The "well-known prefix" reserved for this service is . An IPv6 client embeds the IPv4 address it wishes to communicate with using the host part of the IPv6 network segment, resulting in an ''IPv4-embedded IPv6 addresses'' (hence the 32-bit address space in the IPv6 network segment), and sends packets to the resulting address. The NAT64 gateway creates a mapping between the IPv6 and the IPv4 addresses, which may be manually configured or determined automatically. Principle of operation A simple NAT64 installation may consist of a gateway with two interfaces connected to an IPv4 network and an IPv6 network, respectively. Traffic from the IPv6 networ ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
