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How can i find someone's public ip with an e-mail.

Posted on 2007-11-17
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Last Modified: 2010-03-05
Does anyone know how to find someone's ip address by sending them an e-mail. Maybe i can send the person that i need the ip address from an e-mail with a script that runs as soon as they open the e-mail and sends me an e-mail back with the  public ip address.  Does anyone know of such script? Or any other method of accomplishing this task?
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Question by:ipcipher
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by:b0lsc0tt
ID: 20306574
You can't by just sending the an email.  You would need them to come to your server or send you "something."  However the email doesn't send or do anything.

If you want to do this in a way that the recipient is unaware of then you shouldn't do it.  That would be similar to sending a virus or worm to someone in a message.  I hope this helps but let me know if you have a question.

bol
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by:imitchie
ID: 20306675
though this is something i loathe... but if you do need it, you can send a html email containing an img, i.e. <img src="http://mysecretserver.com/img?id=smile.gif&emailid=1234567890" />
when they open the email, it will fetch the image from your server and you can know where it came from. however, there is no full proof way of doing it.  this is the most benign way i know of, as scripts are most likely blocked, more so than html images (outlook 2007 blocks images by default).
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Merete earned 250 total points
ID: 20306736
have you tried checking the source of the email? Send them an email and in your email setting ( outlook express) indicate a response when received, message received.
Right click the email then properties source.
Internet emails are designed to carry the IP address of the computer from which the email was sent. This IP address is stored in an email header delivered to the recipient along with the message.

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Assisted Solution

by:tigermatt
tigermatt earned 250 total points
ID: 20307128
Unless they send you an email back (in which case their IP address will be shown in the message headers), then technically you have no right to know their IP address. The methods above such as scripts and images are what are used by most major spammers to find out who as read their emails (and subsequently send more messages), and images and scripts are blocked in most major email programs today anyway (images require extra clicks to download them)

I would go down the read receipt route. At least the viewer of the message knows they are sending a message back to you, so if they are technically savvy then they would know that is going to reveal their IP address, but they don't have to click the button to reply. Alternatively, why not word your email so that they have to reply, i.e. in answer to a queston?

-tigermatt
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by:b0lsc0tt
ID: 20313640
Just a note about read receipts.  The option is almost never enabled by default and few users choose to enable it.  It could provide some results but most likely not.  If it is important that you get this then you need to figure a way to have them send you a message (i.e. a reply) or visit your site.

bol
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