[52513] in North American Network Operators' Group
Re: IPv4 country of origin
daemon@ATHENA.MIT.EDU (William Waites)
Thu Oct 3 15:29:08 2002
To: alex@yuriev.com
Cc: nanog@merit.edu
From: William Waites <ww@styx.org>
Date: 03 Oct 2002 15:28:39 -0400
In-Reply-To: <Pine.LNX.4.10.10210031509520.1379-100000@s1.yuriev.com>
Errors-To: owner-nanog-outgoing@merit.edu
>>> "alex" =3D=3D alex <alex@yuriev.com> writes:
alex> Just because free public dbs dont have that info does not
alex> mean that it does not exist.
i guess the question is, "how to ascertain the accuracy of the data?"
if you have a collection of n known address to location mappings,
evenly distributed over the address space, you'd want to approach one
of the private db vendors and say, "do lookups on these n addresses
and tell me the answers." if there's a good correlation between
the known data and the answers, then it might make sense to purchase
data [*] from those people.=20
but.
it is probably necessary to construct the set of control data by hand,
which might be a big job.
what is a sufficiently large n?
for n sufficiently large, are the vendors likely to answer the
question?
i suspect that, in real life, it will come down to trusting the
vendors' assertion that their data is accurate...
-w
[*] purchase data!?!? doesn't information want to be free? or is that
pass=E9? oh well...
--=20
William Waites <ww@styx.org>
Idiosyntactix Research Laboratories
http://www.irl.styx.org
