Re: Getting an IP Address by Jack
Jack
Thu May 20 20:34:43 CDT 2004
On Thu, 20 May 2004 15:16:11 -0700, John Wheatcroft
<JW1234@home164.freeserve.co.uk> wrote:
>Assuming I receive lets say that I receive an email from machine x which is connected to network(s) y this in turn is connected to the internet z
>
>Is it possible, given the domain name to resolve the actual IP address of the machine that sent me the original email
>
>So for example "FRED" who works for "ACMEBALLBEARINGS" and who have a domain called "ACMEBALLBEARINGS.CO.UK"
>sent me an email from his computer at work his works email is not suprisingly "FRED@ACMEBALLBEARINGS.COM" how do I find FRED'S IP Address and if I wanted to how would I go about communicating with FRED'S computer WITHOUT using Email. Lets say I wanted to say "Hello" to fred BUT NOT USING EMAIL - How would I do it ?
The domain name of the sending e-mail address has no connection with
the machine from which the e-mail was sent. I am currently at home,
connected to the Internet via my home ISP comcast.net, so my IP
address is in the comcast.net domain. I can send e-mail using my work
e-mail address, xxx@pebbleridge.com. There is absolutely no
connection between my current IP address and xxx@pebbleridge.com.
To see where the e-mail came from, you would need to parse the
Received headers in the e-mail, and hope that the server which
initially received the e-mail from the user added a Received header
with the sender's IP address. Beware that if the sender is behind a
firewall that uses NAT (Network Address Translation), you will see
either the local IP address of the sender (which is not reachable from
the Internet) or the external IP address of the firewall.