Most lower level are owned by businesses or Internet Service Providers (ISPs). For example, Google maintains various around the world that manage the google.com, google.co.uk, and other domains. Your ISP also maintains as part of your Internet connection setup.
DNS networking is based on the client / server architecture. Your Web browser functions as a DNS client (also called DNS resolver) and issues requests to your Internet provider's when navigating between Web sites.
When a DNS server receives a request not in its database (such as a geographically far away or rarely visited Web site), it temporarily transforms from a server to a DNS client. The server automatically passes that request to another DNS server or up to the next higher level in the DNS hierarchy as needed. Eventually the request arrives at a server that has the matching name and IP address in its database (all the way to the root level if necessary), and the response flows back through the chain of to your client. and Home Networking
Computers on your home network locate a DNS server through the Internet connection setup properties. Providers give their customers the public IP address(es) of primary and backup . You can find the current IP addresses of your DNS server configuration via several methods: on the configuration screens of a home network router
on the TCP/IP connection properties screens in Windows Control Panel (if configured via that method)
from ipconfig or similar command line utilityMore - Top Free Internet Suggested ReadingIntroduction to DNSDNS Lookup - Forward and ReverseDDNS - Dynamic DNSElsewhere on the WebICANNRelated ArticlesIP Tutorial - Domain Name System - DNSDNS - Domain Name System - DNS DefinitionWhat Is a DNS Cache?Definition: DNS - Domain Name ServiceUbuntu Server Guide - Domain Name Service (DNS)
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