Why do we need to register a website in DNS before we add the URL in IIS ?

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I created an application in ASP.NET and published the code in IIS. However on entering the URL for the website, the application did not open.

I found out that I need to register the URL in DNS.
My question is:
What happens when we register the URL in DNS?

Posted 10-Oct-12 0:13am

MikeRox89

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I.explore.code · Accepted Answer · 2012-10-10T00:45:00

It creates a mapping for your URL so that it resolves to your server. Think of it like a key-value dictionary, where key is your URL for e.g. myawesomesite.com and the value would be the IP address for e.g. 123.456.789.21. So when you browse to myawesomesite.com, internally that address would be resolved to the corresponding IP address of your server. This is done so that your server is identified easily on the internet and you don't have to remember IP addresses but rather something more memorable like the URL "myawesomesite.com".

If you are doing it on localhost then you generally don't need to do the DNS thing, but if you want you can by updating your hosts file which resides at C:\windows\system32\drivers\etc\hosts.

Hope this helps.