If you come across a public IP address but your not sure what it is you can use tools such as ripe.net to investigate. In this example, I'm going to attempt to look up yahoo.com (98.138.253.109).
Go to http://www.ripe.net/
In the RIPE database section enter the IP address you want to investigate and click search.
If the details are held by RIPE they will be displayed
Sometimes the IP details are held by another provider
In that case the provider will be listed
In my case it was http://www.iana.org/assignments/ipv4-address-space/ipv4-address-space.xml
I went to iana.org. My IP starts with 98 the page tells me this is held by http://whois.arin.net
I went to http://whois.arin.net/ui entered the IP address into the search bar and click search
This brought up the details of who owns that IP address which of course was Yahoo inc.
There are plenty of other web applications that help you get this information I've found that http://network-tools.com to be useful.
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