With DNS-Lookup you can find various information about a domain name at the click of a button. Simply enter a domain name (e.g. www.google.com) and click "lookup" and you'll find a list of IP addresses associated with the domain along with various other information such as related domain names and location.
Why would you want to lookup info about a DNS? It could be that you want to know more information about the servers behind a domain name; maybe you need to know the server's IP address or its location or you want to find out information about the registrant.
IP-Info has a fast, efficient, responsive user interface which works great from all browsers and devices. The site is also intuitive and provides a variety or articles to explain relevant concepts.