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Re: Lookup zip by IP address [message #172989 is a reply to message #172975]

Mon, 14 March 2011 23:50

Roy Smith
Messages: 11
Registered: November 2010

Karma:

Junior Member

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.

>> 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.

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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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