DNS is referred to as the phonebook of the Internet because when the web was in its infancy, user web traffic on networks required knowledge of the exact IP address in order to visit a site. Rather than typing in something such as “www.google.com,” the user would have to type in the specific IP address numbers. Domain Name Systems was born in the 1980s to automatically map IP address for various websites to the domain names, making it easier for people to browse the Internet and connect directly to specific sites.
DNS directories match domain names to IP address connecting to a network of servers around the world. No one server would be capable of housing all the world’s domains. Instead, a server network exists that allows users to access the same website through different IP address. For example, someone attempting to reach Google.com in Australia is likely to connect through a different server and IP address than a user typing that same domain name into a device in the United States.
Domain Name System filtering, or DNS filtering for short, is a means of blocking access to particular websites, pages, or IP addresses. A DNS filtering configuration restricts access to certain types of web browsing content and is capable of blocking most malicious websites that might expose a singular device or broader network to phishing malware, phishing attacks, and malicious websites.