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What is DNS? What Does DNS Do?

What is DNS?
DNS is the abbreviation of Domain Name System. Its Turkish equivalent is known as Domain Naming System.  DNS is a system for converting host names up to 256 characters into IP. The host name, also known as a fully qualified name, indicates both the computer's name and the Internet domain the computer is in. For example the name In this name, the expression “” indicates the internet domain. DNS resolves the IP address of a given machine name, allowing machines to communicate with hostnames on the Internet.

What Does DNS Do?
DNS provides two-sided conversion between easily understandable and usable machine and domain names and machine IP addresses. Since it is not practical to use and remember IP addresses in daily life, the domain naming system is used. Its main purpose is to respond to inquiries about the domain name or IP number from the network. For this purpose, "Berkeley Internet Name Domain (BIND)" software is widely used. When you want to access a site, DNS determines which site is where, which IP belongs to which computer, and you access where you want.

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Why Change DNS?

DNS (Domain Name System) servers keep the IP addresses of internet addresses registered. Domain names assigned to each of the participating organizations associate various information. Most notably, they translate domain names that can be easily memorized by humans into numeric IP addresses required for computer services and devices worldwide. DNS is a core component for the functionality of most internet services because it is the internet's core executive service.

Here is the event in short: When a person wants to go to any website, for example,, from his computer, he writes this address in the browser and enters, it goes to the DNS server (Telekom, Google, Open) defined on his computer and is matched with the IP address corresponding to this address. DNS Server redirects the verified address to the corresponding IP address (5.135.552.95) of  ( This provides access to the website.

If a server has banned the website (for example, telekom has the authority to ban any website in our country), this identification is done with Telekom DNS Servers. Telecom's DNS server rejects incoming requests and sends an information message on the screen that the access of that site is prohibited. However, you can access this site when you type a different DNS Server address, not Telekom. In other words, it can be used to access a banned website. There are dozens of DNS servers around the world. There is no problem using known DNS Servers.


Domain Name System DNS (Domain Name System) assigns authoritative name servers for each domain, giving the responsibility of assigning domain names and mapping these names to IP addresses.

How to Change DNS?

Control Panel >>> Network and Internet >>> Network and Sharing Center >>> Change Adapter Settings >>> Local Area Connection (Blue Light As Below) >>> Double Click >>>  Properties >>> Internet Protocol Version 4 (TCP/IPv4)


In terms of performance and security, only the user's IP address, Internet Service Provider, and location information are kept on the servers. The IP address of the user in the records is deleted after 24 hours. According to Google's privacy policy, “We may combine personal information from a particular service with information (including your personal information) from other Google services.” but the DNS service is not mentioned here.

The DNS service's privacy page states that the information in DNS is not "associated or combined" with "personal information". The remaining question is whether the ordinary but permanent tracking ID counts as “personal information”.



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