How to determine the Netbios name?

If I know the IP address of a current surfer who is online, is there a way to determine the surfer's netbios or PC's name.

I know I've come across a web page that would automatically scan an IP address and give you the full details of the scanned PC including the host name, OS, etc.. does anyone remember the URL

I hope I dont sound too confusing How to determine the Netbios name?

 

 

 

 

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