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Can I find out who is behind the IP address

I have found a number of IP addresses in one of my logs for an application that is internet based. It shows the history of who logged in with a time and the IP address being used asfollows
Sunday June 22nd 2008 at       02:57:27 AM PDT 99.138.41.121
Saturday June 21st 2008 at       06:24:14 AM PDT 99.138.41.121
Friday June 20th 2008 at       07:29:07 PM PDT 69.198.51.98
Friday June 20th 2008 at       06:56:53 PM PDT 69.198.51.98
Friday June 20th 2008 at       05:30:12 PM PDT 69.198.51.98
Friday June 20th 2008 at       03:46:31 PM PDT 98.195.187.2
Friday June 20th 2008 at       03:41:03 PM PDT 69.198.51.98
Friday June 20th 2008 at       08:31:28 AM PDT 69.198.51.98 ( 1 fail attempts )
Wednesday June 18th 2008 at       07:09:06 AM PDT 65.38.102.125

Is there anyway i can see where that IP address is from?

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dianthonym

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ofkr

You may check the users' IP (those are from US region) in ARIN (American Registry for Internet Numbers) whois : http://www.arin.net/whois/

For other regions whois servers :

AfriNIC : http://www.afrinic.net/cgi-bin/whois
APNIC: http://wq.apnic.net/apnic-bin/whois.pl
LACNIC: http://lacnic.net/cgi-bin/lacnic/whois
RIPE: http://www.ripe.net/perl/whois/
InterNIC: http://www.internic.net/whois.html