I am using online tools as well
something like http://www.ip2location.com/65.34.6.77 is quite useful for me because i just like its shortcut url! unfortunately they only allows 20 lookups for free per day
You have to be careful with that site because they are actually reading your IP address, so I would not use that site since I don't think it is that secure unless they have changed things since I went on it accidentally a long time ago. Now I stay away from it.
Every site I have ever been to that lets you track IP's also tells you what yours is. The Shields Up site does the same thing. I hardly think that's a reason to stay away. It's an indication of the site's capabilities if anything. For that matter, every site you go to knows your IP address. They just don't tell you.