What is DNS

What is DNS?
Network Solutions defines DNS as :

"Domain Name Servers (DNS) are the Internet's equivalent of a phone book. They maintain a directory of domain names and translate them to Internet Protocol (IP) addresses.
This is necessary because, although domain names are easy for people to remember, computers or machines, access websites based on IP addresses. 
Information from all the domain name servers across the Internet are gathered together and housed at the Central Registry. Host companies and Internet Service Providers interact with the Central Registry on a regular schedule to get updated DNS information. 

When you type in a web address, e.g., www.jimsbikes.com, your Internet Service Provider views the DNS associated with the domain name, translates it into a machine friendly IP address (for example is the IP for jimsbikes.com) and directs your Internet connection to the correct website. 
After you register a new domain name or when you update the DNS servers on your domain name, it usually takes about 12-36 hours for the domain name servers world-wide to be updated and able to access the information. This 36-hour period is referred to as propagation."

Another great clarification on DNS is worth noting per WebOpedia

" Short for Domain Name System (or Service or Server), an Internet service that translates domain names into IP addresses. Because domain names are alphabetic, they're easier to remember. The Internet however, is really based on IP addresses. Every time you use a domain name, therefore, a DNS service must translate the name into the corresponding IP address. For example, the domain name www.example.com might translate to" 

A new element that is increasingly becoming important is IP6 addressing in DNS. In other words, a domain may be required to have both an IP4 address as well as an IP6 address in order to function properly. Not all hosting providers are utilizing the IP6 addressing but IP4 is still the global standard. HostAlamo.com for example utilizes both IP4 and IP6 addressing for all domain hosting. 

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