Google Public DNS is a Domain diagnose System ( DNS ) service offered to Internet users worldwide by Google. It functions as a recursive name server. Google Public DNS was announced on 3 December 2009, [ 1 ] in an effort described as “ making the web faster and more fasten ”. [ 2 ] [ 3 ] As of 2018, it is the largest public DNS service in the populace, handling over a trillion queries per day. [ 4 ] Google Public DNS is not related to Google Cloud DNS, which is a DNS host service .
The Google Public DNS service operates recursive list servers for populace use at the following four IP addresses. [ 5 ] The addresses are mapped to the nearest operational server by anycast route. [ 6 ]
The service does not use conventional DNS identify server software, such as BIND, alternatively relying on a custom-designed implementation, conforming to the DNS standards set forth by the IETF. It amply supports the DNSSEC protocol since 19 March 2013. previously, Google Public DNS accepted and forwarded DNSSEC-formatted messages but did not perform establishment. [ 7 ] [ 8 ]
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Some DNS providers commit DNS hijacking while processing queries, redirecting web browsers to an ad web site operated by the supplier when a nonexistent knowledge domain name is queried. The Google overhaul correctly replies with a non-existent sphere ( NXDOMAIN ) response. [ 9 ] The Google service besides addresses DNS security. A park attack vector is to interfere with a DNS avail to achieve redirection of web pages from legitimate to malicious servers. Google documents efforts to be tolerant to DNS cache poison, including “ Kaminsky Flaw ” attacks american samoa well as denial-of-service attacks. [ 10 ]
The Google Public DNS64 service operates recursive name servers for public use at the following two IP addresses for function with NAT64. [ 11 ] These servers are compatible with DNS over HTTPS .
Google stated that for the purposes of performance and security, the querying IP savoir-faire will be deleted after 24–48 hours, but Internet overhaul supplier ( ISP ) and placement information are stored permanently on their servers. [ 12 ] [ 13 ] [ 14 ]
In December 2009, Google Public DNS was launched with its announcement [ 15 ] on the Official Google Blog by product coach Prem Ramaswami, with an extra post on the Google Code web log. [ 16 ] In January 2019, Google Public DNS adopted the DNS over TLS protocol. [ 17 ]
At the launching of Google Public DNS, it did not directly support DNSSEC. Although RRSIG records could be queried, the AD ( Authenticated Data ) ease up was not set in the launch version, meaning the server was unable to validate signatures for all of the datum. This was upgraded on 28 January 2013, when Google ‘s DNS servers mutely started providing DNSSEC validation data, [ 18 ] but only if the node explicitly set the DNSSEC OK ( DO ) flag on its question. [ 19 ] This service requiring a client-side flag was replaced on 6 May 2013 with wax DNSSEC validation by default, meaning all queries will be validated unless clients explicitly opt out. [ 8 ]
Since June 2014, Google Public DNS mechanically detects nameservers that support EDNS Client Subnet ( ECS ) options as defined in the IETF draft ( by probing list servers at a abject rate with ECS queries and caching the ECS capability ), and will send queries with ECS options to such name servers automatically. [ 20 ]
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censoring in Turkey
In March 2014, use of Google Public DNS was blocked in Turkey after it was used to circumvent the stop of Twitter, which took consequence on 20 March 2014 under woo order. The pulley was the result of earlier remarks by Prime Minister Tayyip Erdogan who vowed to “ wipe out Twitter ” following damaging allegations of corruption in his inner circle. The method became popular after it was determined that a simple domain name block was used to enforce the ban, which would well be bypassed by using an understudy DNS system. Activists distributed information on how to use the servicing, and spray-painted the IP addresses used by the service as graffito on buildings. Following the discovery of this method acting, Google Public DNS was blocked wholly. [ 21 ] [ 22 ] [ 23 ]