Questions about Nmap

I am fooling around with Nmap self studying for my CEH and have a few questions.

I am trying to use the name server lookup utility in Nmap to find the ip address of a website. Would it be "nmap -sn www.site.com"?

How would I then determine if port 80 and port 443 are open on this site?

Thanks!
WilliamK99Asked:
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Ashok DewanConnect With a Mentor FreelancerCommented:
Check this it will help you

http://www.gnulinuxclub.org/index.php?option=com_content&task=view&id=350&Itemid=31p 

nmap does not forward lookup and it does reverse lookup
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WilliamK99Author Commented:
Fantastic link, it was just what I was looking for, that page and the more advanced page has given me a plethora of knowledge. Thanks so much!
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WilliamK99Author Commented:
Top notch link!
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Ashok DewanFreelancerCommented:
Your Welcome !
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