Editing Ad blocking (section)

===DNS filtering===
Advertising can be blocked by using a DNS server which is configured to block access to domains or hostnames which are known to serve ads by spoofing the address.<ref>{{cite web |url=http://www.deer-run.com/~hal/sysadmin/dns-advert.html |title=A Simple DNS-Based Approach for Blocking Web Advertising |publisher=Deer Run Associates |date=13 August 2013 |first=Hal |last=Pomeranz |access-date=23 March 2019 |archive-date=2 March 2014 |archive-url=https://web.archive.org/web/20140302143447/http://www.deer-run.com/~hal/sysadmin/dns-advert.html |url-status=live }}</ref> Users can choose to use an already modified DNS server<ref>{{Cite web|url=https://adguard.com/en/adguard-dns/overview.html|title=How to set up AdGuard DNS|website=adguard.com|language=en|access-date=25 October 2019|archive-date=6 January 2017|archive-url=https://web.archive.org/web/20170106152630/https://adguard.com/en/adguard-dns/overview.html|url-status=live}}</ref><ref>{{Cite web|url=https://alternate-dns.com/|title=Alternate DNS – Ad Blocking DNS Server|website=alternate-dns.com|access-date=25 October 2019|archive-date=25 October 2019|archive-url=https://web.archive.org/web/20191025085358/https://alternate-dns.com/|url-status=live}}</ref><ref>{{Cite web|url=https://blockerdns.com/tryit|title=blockerDNS – Get it Now!|website=blockerdns.com|access-date=25 October 2019|archive-date=25 October 2019|archive-url=https://web.archive.org/web/20191025085359/https://blockerdns.com/tryit|url-status=live}}</ref> or set up a dedicated device running adequate software such as a [[Raspberry Pi]] running [[Pi-hole]] themselves.<ref>{{cite web |url=https://jacobsalmela.com/2015/06/16/block-millions-ads-network-wide-with-a-raspberry-pi-hole-2-0/ |title=Block Millions of Ads Network-wide with a Raspberry Pi-hole 2.0 |first=Jacob |last=Salmela |date=16 June 2015 |access-date=23 March 2019 |archive-date=13 April 2020 |archive-url=https://web.archive.org/web/20200413111320/https://jacobsalmela.com/2015/06/16/block-millions-ads-network-wide-with-a-raspberry-pi-hole-2-0/ |url-status=live }}</ref> Manipulating DNS is a widely employed method to manipulate what the end-user sees from the Internet but can also be deployed locally for personal purposes. China runs its own [[Root name server|root DNS]] and the EU has considered the same. [[Google]] has required their [[Google Public DNS]] be used for some applications on its [[Android (operating system)|Android]] devices. Accordingly, DNS addresses/domains used for advertising may be extremely vulnerable to a broad form of ad substitution whereby a domain that serves ads is entirely swapped out with one serving more local ads to some subset of users. This is especially likely in countries, notably [[Russia]], [[India]] and [[China]], where advertisers often refuse to pay for clicks or page views. DNS-level blocking of domains [[Great Firewall|for non-commercial reasons]] is already common in China.<ref>{{cite web |url=https://www.circleid.com/posts/20100521_extent_of_dns_services_being_blocked_in_china/ |title=The Extent of DNS Services Being Blocked in China |publisher=Circleid.com |first=Brenden |last=Kuerbis |date=21 May 2010 |access-date=23 March 2019 |archive-date=23 March 2019 |archive-url=https://web.archive.org/web/20190323225451/https://www.circleid.com/posts/20100521_extent_of_dns_services_being_blocked_in_china/ |url-status=live }}</ref>