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How can I find out what IP address is being used on the internet?

Hello:

I just got a message from our Internet Servie provider that we had a alert come up for badwidth at my company.  It is over now; but the last time that they called us, a PC had a virus and was downloading some games.... Hence, I would like to investigate.  

In the previous call ticket the problem was with 1 specific user/PC that connected to the destination IP; but, now according to my firewall software it is many different computers.  It migth be of no concern at all; but I have a question of ....

Question1:  How can I find out what the IP addess is that our ISP told me about?  If I put that IP address into a web browser I get nothing.  If I run an "nslookup" (in DOS) that IP address I get "host26.us.bosch.com"  How can I find out what this IP Address is?

They were using port 80.
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Pkafkas
Asked:
Pkafkas
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2 Solutions
 
achaldaveCommented:
You can get IP details from arin.net or apnic.net, this will give you details about who owns the IP range (mostly ISPs) and not whom it is assigned to. You can also try http://www.visualroute.com/
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tmoore1962Commented:
type in 'whatismyip.com' on your browser it will give you the current Public Ip address for your network
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Jan SpringerCommented:
It sounds like you need to find the possible problem within your own network.

Chances are you use NAT and possibly PAT.  You would need your firewall logs from the date in question and lookup the public IP in the complaint to find out which local IP had that assignment at that time.
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PkafkasNetwork EngineerAuthor Commented:
I just want to find out what web address or what application is using the IP address that the alret was triggered for.  I want to know what it was doing.

so, I haev the IP address from the alert that is from the outise world.  is there a way to query an Ip address and then learn about its origins?
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PkafkasNetwork EngineerAuthor Commented:
I should re-phrase, is there a free way of findingout what the destinatin IP is?

Sorry about that.  I just saw that the above mentioned web sites required purcahsed subscriptions.
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Jan SpringerCommented:
The logs will have the local and destination IPs.
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achaldaveCommented:
On the arin.net site you can search for IP without subscription, on the top right corner there is a search box "Search Whois".
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Dave HoweCommented:
I would assume the IP would be *Yours* and shared amongst all your pcs. I would check the firewall, see if it is hosting that IP on the outside, and if so, if there are any usage logs - the gui on many firewalls gives a "top talkers" summary that can let you track down bandwidth hogs, and/or you can use third party monitor software for the same purpose.
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