How to trace ip address?

Hi,
I want to know how to trace or find out ip address of a person chatting with you on Yahoo messenger?
Yesterday my friend while chatting with me found my ip address don't know how?

Read this!
1.Most common way of compromising IP is to pass link to someone in IM. It is easy to create web page (containing anything: funny pic, video etc – than by adding script to page with help of free service like StatCounter: http://www.statcounter.com/ log IPs and system info (operating system name and version, browser name and version, last visited site prior to clicking – etc etc) of all people which visited site. There are also free (bit gay and fishy) programs which allow to send link in IM which when clicked display IP of person in it’s window.

2.By taking advantage of fact that some chat communications: some IMs, cams (supermode always) as well other chat communications are connecting sometimes via peer-to-peer connection, by using monitoring tools like mentioned netstat command (type: nestat –b), firewall monitor, this free tool: (http://www.microsoft.com/technet/sysinte... ) or best - packet sniffer, it is possible to monitor (and/or log) all connection which allows determining IP of person with which you instant message, watch cam (or allow watch yours) etc.

To prevent someone from getting your IP you could:

1.Download YTunnel which allows blocking peer-to-peer connection in it’s preferences: http://www.ytunnelpro.com/ (you could also set firewall rules to do same however using tunnel is probably just easier).
2.Don’t click any links, especially since beside giving your IP you could get trojaned in totally invisible manner by briefly visiting page alone (unless you know how to do it safely) – to see how download and listen to audition #7 (fast forward it to 20 minutes 50 seconds) from this page: http://www.grc.com/SecurityNow.htm
3.Use proxy, or better (and safer) VPN client which will hide your IP both when clicking links and from sniffed chat communication – free, extremely easy to use zero configuration VPN client http://www.iopus.com/ipig/
4.Set your home to dynamic IP connection which allows changing IP on fly, should a need arise as when you suspect someone might have compromised your IP.

Even hacking through IP is relatively difficult, in most cases beyond reach of most chat hacker wanna-bes and booter kiddies, it is possible, therefore protecting own IP in chat is definitely security concern.

Hi,
Check out this guide!
http://forums.techarena.in/guides-tutorials/443453.htm
AND
http://forums.techarena.in/tips-tweaks/1000947.htm
Hope this helps!

I thing this can work (it works with MSN):

Ask them to open a file (send them a picture of your dog, for exemple).
When they opened your file, start>run>cmd (or command in Win98). Type netstat -n and look at the last entry. (you'll get there IP).

OR

Ask them to send you an email and look at the header. To do that, in hotmail, Options(top right corner)>Mail(left side)>Mail Display Settings>Message headers,set to advance. In Outlook,right click the email>properties>details.It will look like this(maybe longuer but we don't care about the rest)

MIME-Version: 1.0
X-Originating-IP: [XXX.XXX.XXX.XXX]
X-Originating-Email: [blabla@hotmail.com]
X-Sender: blabla@hotmail.com
Received: from XXX.XXX.XXX.XXX by by1fd.bay1.hotmail.msn.com with HTTP;Wed, 10 Nov 2004 17:17:31 GMT

The Xs is the IP.

Then go to http://www.geobytes.com/IpLocator.htm and type the IP and you'll get a bunch of info.

Thanks guys that was a superb responce to my question!
Thanks for those links too!
@ mijaba the guides were informative!