Re: Computer ID / IP Address Questions

This site might be of interest to you; see the -IPs Explained- links.
http://whatismyip.com/

As for the IP you have, that is assigned by your ISP and changes from time
to time. Depending on the ISP, it might change every time you start OE or
any 'net program. It's not contained on your hard drive because it changes
all the time. It's just assigned to you for that internet session on
dialup, and less often on DSL. Sometimes it might be a few weeks before a
DSL IP changes, but it will unless you're payhing extra money to have it NOT
change. That's a necessity only for some web sites though, not emailing.

When you read an email's Headers, the TOPmost header is the most recent.
Next older is below that, and so on, all the way back, ideally, to the
originating IP. Some places, like Yahoo, can ma,e a mess out of Headers,
but they're still accurate unless someone has purposely managed to
forge/change them somehow. But, the trail of Headers still works. Wherever
you sent the mail from (internet connection point) should be the lowest item
in the Headers.

Pop`



mark4man wrote:
People...

When I e-mail my office computer at work, from home...If I check out
the e-mail's properties on the Details tab...it tells me the message
was "Received From": 1) a unique ID c/o letters & numbers (e.g.,
bubba9axb7yui4bt); & 2) a 12 digit number (looking similar to
123.456.789.123). I am assuming the first is my Computer ID; & the
second my IP Address.

If I then go to my web mail service (in this case, yahoo), send an
e-mail back to my home computer; & check out that e-mail's
properties...in that message source, the very last "Received From"
listing also shows my home machine's IP address.

So...a few questions:

1) That first ID...that is in fact my Computer ID, unique to only my
machine, right?...& where do I find that ID's location/information on
my hard drive?

2) The second number...that is in fact my IP Address, right? Is that
number unique to my machine, or is it a number assigned by my ISP
(meaning...does it change if I change internet service providers?)

3) How in the heck did yahoo know my web mail message originated from
my computer? Does their e-mail utility do a search of the user's hard
drive to locate that number in a specific file & folder...or do they
get it from the home e-mail address one provides when they sign up?

Thanks,

mark4man



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