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Re: Lookup zip by IP address [message #172990 is a reply to message #172989]

Tue, 15 March 2011 00:25

The Natural Philosoph
Messages: 993
Registered: September 2010

Karma:

Senior Member

Roy Smith wrote:
> The Natural Philosopher <tnp(at)invalid(dot)invalid> wrote:
>
>>> Most web applications maintain some state in a browser cookie which they
>>> use to establish session continuity across multiple HTTP requests. Each
>>> of those HTTP requests uses a new TCP connection.
>> Not always, as I understand it.
>>
>> http://en.wikipedia.org/wiki/HTTP_persistent_connection
>
> I omitted that because it seemed like an unnecessary complication to the
> discussion. You are, however, absolutely correct that it is possible.
> I really should have tossed "(in general)" in there somewhere.

I think its actual default behaviour these days, but I am not sure
enough to make that an assertion.
>
>>> On a host with multiple interfaces (or a mobile host),
>> Or a DHCP client that goes 'off line' briefly..
>
> Yup, that's another scenario where a machine could change IP addresses.
> It's pretty common, however, for DHCP servers to give the same IP
> address back to a given host (identified by MAC address) when it asks
> for a new one.
>
> I missed the beginning of this thread, but just looking at the subject
> line, I should mention one other concept. Even with geolocation
> databases, all you really know from the client's IP address is where
> egress router is (assuming the client is behind a NAT or something
> similar). For example, I used to work at a place that had a corporate
> VPN. I'm located in New York, but when I was on the VPN, to an external
> web server, my IP address looked like it was in Massachusetts because
> that's where corporate headquarters were and thus where the VPN
> connected to the outside world. So, if I was on the VPN and went to
> moviephone.com, it would show me what movies were playing in the
> Hopkinton area.

Indeed. Here in the UK all broadband is tunneled over a PPP over ATM
backhaul link. Those in general terminate either in London, or in maybe
Manchester or Glasgow, IIRC

Reverse lookup codes TEND to reveal where your ISP's HQ is registered -
unless you have a registered corporate IP address - , not where the
lines even terminate.

Manual tracerouting to the target is often the best way to guess where
the connection comes from, but even that is no guarantee of anything,
for the reasons you give.

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[Message index]

		Lookup zip by IP address By: laredotornado@zipmail on Mon, 10 January 2011 18:29
		Re: Lookup zip by IP address By: Michael Fesser on Mon, 10 January 2011 18:36
		Re: Lookup zip by IP address By: Heiko Richler on Mon, 10 January 2011 18:52
		Re: Lookup zip by IP address By: Twayne on Mon, 10 January 2011 20:44
		Re: Lookup zip by IP address By: Captain Paralytic on Mon, 10 January 2011 22:02
		Re: Lookup zip by IP address By: Twayne on Mon, 17 January 2011 20:46
		Re: Lookup zip by IP address By: Thomas 'PointedEars' on Sat, 12 March 2011 01:57
		Re: Lookup zip by IP address By: Jerry Stuckle on Sat, 12 March 2011 03:13
		Re: Lookup zip by IP address By: D. Stussy on Sat, 12 March 2011 07:32
		Re: Lookup zip by IP address By: Thomas 'PointedEars' on Sat, 12 March 2011 08:37
		Re: Lookup zip by IP address By: Jerry Stuckle on Sat, 12 March 2011 13:21
		Re: Lookup zip by IP address By: Roy Smith on Sat, 12 March 2011 14:16
		Re: Lookup zip by IP address By: Jerry Stuckle on Sat, 12 March 2011 15:02
		Re: Lookup zip by IP address By: me on Sat, 12 March 2011 16:35
		Re: Lookup zip by IP address By: The Natural Philosoph on Sat, 12 March 2011 16:59
		Re: Lookup zip by IP address By: Jerry Stuckle on Sat, 12 March 2011 19:02
		Re: Lookup zip by IP address By: me on Sat, 12 March 2011 23:28
		Re: Lookup zip by IP address By: Jerry Stuckle on Sun, 13 March 2011 02:33
		Re: Lookup zip by IP address By: Luuk on Sun, 13 March 2011 14:58
		Re: Lookup zip by IP address By: Jerry Stuckle on Sun, 13 March 2011 17:32
		Re: Lookup zip by IP address By: Luuk on Sun, 13 March 2011 17:46
		Re: Lookup zip by IP address By: Jerry Stuckle on Sun, 13 March 2011 19:35
		Re: Lookup zip by IP address By: spambait on Sun, 13 March 2011 21:52
		Re: Lookup zip by IP address By: The Natural Philosoph on Sun, 13 March 2011 21:28
		Re: Lookup zip by IP address By: Jerry Stuckle on Sun, 13 March 2011 21:37
		Re: Lookup zip by IP address By: Twayne on Mon, 14 March 2011 15:51
		OT Re: Lookup zip by IP address By: Twayne on Mon, 14 March 2011 15:49
		Re: OT Re: Lookup zip by IP address By: The Natural Philosoph on Mon, 14 March 2011 17:17
		Re: OT Re: Lookup zip by IP address By: Twayne on Tue, 15 March 2011 15:17
		Re: Lookup zip by IP address By: Twayne on Mon, 14 March 2011 15:40
		Re: Lookup zip by IP address By: me on Mon, 14 March 2011 02:12
		Re: Lookup zip by IP address By: Jerry Stuckle on Mon, 14 March 2011 02:42
		Re: Lookup zip by IP address By: Twayne on Mon, 14 March 2011 16:02
		Re: Lookup zip by IP address By: Jerry Stuckle on Mon, 14 March 2011 16:07
		Re: Lookup zip by IP address By: The Natural Philosoph on Mon, 14 March 2011 02:49
		Re: Lookup zip by IP address By: spambait on Mon, 14 March 2011 04:20
		Re: Lookup zip by IP address By: Twayne on Mon, 14 March 2011 15:54
		Re: Lookup zip by IP address By: Twayne on Mon, 14 March 2011 15:39
		Re: Lookup zip by IP address By: spambait on Sat, 12 March 2011 23:13
		Re: Lookup zip by IP address By: Twayne on Sat, 12 March 2011 19:19
		Re: Lookup zip by IP address By: Twayne on Sat, 12 March 2011 19:17
		Re: Lookup zip by IP address By: Twayne on Sat, 12 March 2011 19:14
		Re: Lookup zip by IP address By: Thomas 'PointedEars' on Sun, 13 March 2011 23:45
		Re: Lookup zip by IP address By: Jerry Stuckle on Sat, 12 March 2011 13:16
		Re: Lookup zip by IP address By: Michael Fesser on Mon, 14 March 2011 11:23
		Re: Lookup zip by IP address By: The Natural Philosoph on Mon, 14 March 2011 13:29
		Re: Lookup zip by IP address By: Roy Smith on Mon, 14 March 2011 13:40
		Re: Lookup zip by IP address By: The Natural Philosoph on Mon, 14 March 2011 13:54
		Re: Lookup zip by IP address By: Roy Smith on Mon, 14 March 2011 23:50
		Re: Lookup zip by IP address By: The Natural Philosoph on Tue, 15 March 2011 00:25
		Re: Lookup zip by IP address By: Tobiah on Thu, 07 April 2011 17:01
		Re: Lookup zip by IP address By: The Natural Philosoph on Tue, 11 January 2011 11:25
		Re: Lookup zip by IP address By: Twayne on Mon, 17 January 2011 20:48
		Re: Lookup zip by IP address By: Captain Paralytic on Mon, 10 January 2011 22:05
		Re: Lookup zip by IP address By: Romia Super on Tue, 18 January 2011 09:27

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