Understanding How Domain Names works.

Think of the your phone number.  When you trying to call someone abroad, you go through following procedure:

You find the numbers from either from a phone book or your contact list.
Your dial the country code, followed by city code and the number.

Domain name works very similar this but doamin look up itself is done in reverse order (i'll explain this little bit later in the article).  To understand this, you need know how domain name itself is constructed.  A domain name has at least 2 two parts.  NAME element and EXTENSION separated by a dot (.) symbol, for example, abc.com

.com is know as top level or master extension, there are second level or third level extesions available like .co.uk (second level) or ac.co.uk (third level).  So, domain name is usually made of the NAME.EXTENSION. NAME part of the is supplied by user and EXTENSION part is assigned by the registrar depends on type of domain being registered.

Lookup Procedure

Every time you visit a web site, you actually looking up a DNS records.  There are no visual indicators, but all this handled by various Domain look up system specific software including your web browser.  Domain Lookup is done in reverse order.  For example, say you visiting a fresh domin abc.com. Look up will be done by records that held in the root server (.com) and then root server direct you to the name server that holds the DNS records.  Another word, abc.com is looked up as com.abc.
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