Most computers on TCP/IP networks make use of the Domain Name System (DNS). Setting up DNS on client devices necessitates identifying the DNS servers to make use of. Network administrators (on the world wide web, service providers) keep and install these DNS servers. DNS servers have been set up by numerous suppliers on the web for free public access including the well known and particularly popular ones given below. Some suppliers also offer other discretionary services, including website filtering, as well as normal name resolution.

A great DNS server supports both dependability and high performance. Particularly on high-traffic networks, DNS servers must manage a substantial load of name and address lookups to support Web browsing, e-mail and other uses. DNS dependability can change determined by the supplier, and operation can change depending on the place of a client. Utility program like GRC DNS Standard or netbench are available on the internet to assist individuals select and recognize public DNS servers that are favorite for them based on diagnostic tests.

These DNS servers may be obtained from any public Internet domain name. The world’s biggest public DNS service is operated by Google.

— OpenDNS
The earliest of all services on this particular list, OpenDNS additionally supports billions of DNS queries daily via its servers working on 208.67.222.222 and 208.67.220.220. Besides the list’s fundamental name resolution service, OpenDNS Home Solutions supplies free Web site filtering of mature content (called FamilyShield) and URL charm correction with accompanying software that is installed. The business also sells various security products to companies. Those seeking an option to Google products as well as a service which operates nicely outside the U.S. additionally tend to enjoy OpenDNS

— DNS Advantage
A firm called Advantages manages both the DNS Advantage service that was complimentary in addition to the commercial (not free) UltraDNS system.

— ScrubIT
Designed to mechanically block pornographic and other Web sites that were unwanted, ScrubIT received mixed reviews for its competitive filtering policies and made its introduction in 2007. The product has been discontinued.