Can you track someone's ISP from a post they make on here?
551245
No but if there is a real reason you want to I do not know for sure but I am sure yahoo answers support team can. If something happened you can contact them and just find out.
736378
The IP ADDRESS at the top of full header. Will tell you if its the same person.
290484
You can use a website tracking code like this one:\nhttp://www.statcounter.com/\n\nI've used this before and it's pretty easy to use. You can see where the person who visits your site lives, they're ip address and how many visitors you have at any given day.
196201
There is one way to find out what country it was sent from.\nLook at the headers for something that takes \nReceived: from IPHost (name) [IP Address])\nby your ISP Server (Postfix) with ESMTP id 3248F37B8B5\nfor <your email address>\nTake that IP address and enter it into\nhttp://ip2location.com/free.asp\nand it would tell you where the server is,\nif it is a local ISP (not a big company) its very useful.
697732
assuming you know the IP address go to this website to plot it on a map: http://visualroute.visualware.com/
227655
You can use a proxy server, like the ones found here:  http://www.publicproxyservers.com/.  However keep in mind even that information is logged and if the proper authorities show the need it can still be traced back to you.
624807
If you have access to the message in question, try to see the FULL HEADERS of the message where you can see the originating IP address. Then trace that IP address with a service like VisualRoute and it will give you an idea of where it came from.
254092
Yes.  Your IP and MAC addresses can be logged by the service provider.  This is generally used to track your surfing habits so that online retailers and such can provide more accurate advertising for sales.  It is also used as study for some to provide better services.  They cannot use this information against you in any way unless you have been caught engaging in illegal activity over the internet such as hacking or building child porn sites and such.  It is possible for all ISPs to track surfing habits, but not all do (unless asked to by law enforcement).  Check your service provider's privacy policy to get more specific information.
667198
While I cannot say this with 100% accuracy, I will say no.  I believe that your internet connection itself is not confidential.  There are tools such as a packet sniff that can reveal what your activity has been and where you are.  Also, if you recall, Ask Jeeves used to show what other people were searching.
416242
Check an IP address locator's on line
734844
i have a phpbb forum and the only thing you can do with it is check who is providing the internet to that service...its a way if that person is posting illegal stuff..like how to make bombs and stuff you can just contact there isp and they'll handle the rest...thats whats its basically for.. but im not sure if they can obtain general location cause thats not possible unless they hack into the ISP. only thing your gonna get is IP address and service provider
15890
Could also be your ISP
550783
call your isp and get info
76791
sign in to your isp and check it
25867
proxy server, anon servers, but ultimately you can't, you can be traced if you are doing anything illegit..
819462
Yes,  ISP's and other corporations such as Yahoo have a legal and ethical obligation to inform the internet crime division of the police agency in the jurisdiction that the poster made these postings.  The user's IP address is pretty much a road map to their house at the time that they posted the comment.  This is why a lot of cyber cafe's and places that the people think they are anonymous have discrete video surveillance or require a credit card etc.  Someone who incites hate, makes threats or confesses a criminal offence will be investigated, but there is a huge backlog on these investigations so the poster won't get a knock on his door likely for weeks or months.
366860
It's very simple prog to grab an IP address. But having someones IP addy don't really mean diddly anyway as the most they can do with it is find the city name and Host Server with it anyway.\nThe person using it can not be traced by a normal user and the ISP would never give out that information to anyone with the rare exception the cops want it for criminal activity.