An Insight about DNS Lookup

An Insight about DNS Lookup

Thursday, November 17th, 2011

DNS lookup a tool that is used to determine the IP address using a domain name. There are two factors which are important inorder to communicate over the web, a server holding the website or an application with an IP address and a browser that knows the DNS. In short, a DNS is a central database that holds information about all the sites that are functional over the World Wide Web.

DNS lookup is used for finding the IP address using a particular domain name, which means using a website address users can determine the the server where it is hosted. Based on the same grounds, the rDNS or reverse DNS lookup too is popular and helps in determining a domain name using a known IP address. Though this can only be tracked if a particular site has a dedicated IP address attached to it.

Due to the increasing trend of spamming and online frauds a number of webmasters choose to keep their details hidden by opting for WHOis protect feature. Each user over the Internet has some or the other IP address associated with, ie. IP of a computing machine or a website. But usually spammers often break this rule by choosing to carry out their fraudulent activities from servers that have shared IP addresses assigned to an account. DNS lookup scans for an IP address and domain name to steer clear of spam mailers. Though not the best tool and has limitations of its own due to a fact that number of websites now-a-days use the option of rotating IP’s making it hard to determine a domain name that has indulged in sending spam emails or anything unethical has been carried out. Moreover, the tool may seem helpless due to network delays and in cases when the servers aren’t configured appropriately.

It is mandatory to setup a DNS on a server and inorder to do that one may ask the professionals to do that for you and have a well configured DNS lookup on a server. Various techniques are adopted to reduce the DNS lookup time so that before a browser can establish a network connection to a web server, it resolves the DNS name of the web server to an IP address. The resolution of DNS is cached by the client’s browser and operating system, so that next time a request is made to the same page, there is no latency involved.

Author : Stanley Jones | Eukhost Limited

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