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i18n/ja/advanced/dns-overview.md
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---
title: "DNS Overview"
title: "DNSの概要"
icon: material/dns
description: The Domain Name System is the "phonebook of the internet," helping your browser find the website it's looking for.
description: ドメインネームシステム（DNS）は「インターネットの電話帳」であり、ブラウザが探しているウェブサイトを見つけるのに役立ちます。
---
The [Domain Name System](https://en.wikipedia.org/wiki/Domain_Name_System) is the 'phonebook of the Internet'. DNS translates domain names to IP addresses so browsers and other services can load Internet resources, through a decentralized network of servers.
## What is DNS?
## DNSとは？
When you visit a website, a numerical address is returned. For example, when you visit `privacyguides.org`, the address `192.98.54.105` is returned.
ウェブサイトにアクセスすると、数値のアドレスが返されます。 たとえば、 `privacyguides.org`にアクセスすると、アドレス `192.98.54.105` が返されます。
DNS has existed since the [early days](https://en.wikipedia.org/wiki/Domain_Name_System#History) of the Internet. DNS requests made to and from DNS servers are **not** generally encrypted. In a residential setting, a customer is given servers by the ISP via [DHCP](https://en.wikipedia.org/wiki/Dynamic_Host_Configuration_Protocol).
DNSはインターネットの[初期](https://en.wikipedia.org/wiki/Domain_Name_System#History)から存在しています。 DNS requests made to and from DNS servers are **not** generally encrypted. In a residential setting, a customer is given servers by the ISP via [DHCP](https://en.wikipedia.org/wiki/Dynamic_Host_Configuration_Protocol).
Unencrypted DNS requests are able to be easily **surveilled** and **modified** in transit. In some parts of the world, ISPs are ordered to do primitive [DNS filtering](https://en.wikipedia.org/wiki/DNS_blocking). When you request the IP address of a domain that is blocked, the server may not respond or may respond with a different IP address. As the DNS protocol is not encrypted, the ISP (or any network operator) can use [DPI](https://en.wikipedia.org/wiki/Deep_packet_inspection) to monitor requests. ISPs can also block requests based on common characteristics, regardless of which DNS server is used. Unencrypted DNS always uses [port](https://en.wikipedia.org/wiki/Port_(computer_networking)) 53 and always uses UDP.