Στις 13/7/2013 9:21 μμ, ο/η Dennis Lee Bieber έγραψε:
On Sat, 13 Jul 2013 20:43:14 +0300, ??????? <ni...@superhost.gr> declaimed
the following:
But then how do you explain the fact that
http://www.maxmind.com/en/geoip_demo
pinpointed Thessalon�ki and not Athens and for 2 friends of mine that
use the same ISP as me but live in different cities also accurately
identified their locations too?
You have encountered an ISP that reserves IP blocks for specific
suburbs/cities -- and can be tracked thereby. That is, all IPs in
xxx.yyy.zzz.??? may be held for just one neighborhood (granted, I've
defined an old class C network there, but modern network assignments are no
longer in A/B/C (8/16/24 bit network address, with 24/16/8 bit node
addresses) assignments.
It all comes down to how the ISP allocates addresses. It may be that
(as in my case) the ISP is irrelevant -- the IP is issued by the phone
company that actually provides the DSL, and a block of IPs is allocated to
each "central office" of that phone company... And thereby, regardless of
the lease renewal, the IP is still identified as belonging to that central
office location (or whatever location the phone company supplies to the
location service for the IP block).
You are right and i can back this up.
While FORTHnet ISP(my ISP) works well with maxmind which can pinpoint
the visitor's exact location other ISPs like Cyta, OTEnet, HOL always
says Europe/Athens.
So it seems that all boil down to the way the ISP configure its blocks
of ip addresses per city.
All should do the same and then it would be an easy task to accurately
identify a visitor by its ip address.
--
What is now proved was at first only imagined!
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