[olug] list of United States IP blocks

Trent Melcher trentm at trackd.run
Fri Jan 12 17:20:43 CST 2018

We have only had 1 issue with Google's GeoIP in the 5 years that we have
used them.  They typically do a very good job at it since their business
relies on it heavily.  We didn't realize how much until we tried to
advertise US IP address in some of our overseas offices.  Come to find out
thats how google decides what datacenter they are going to send you to for
your docs,email, maps.  Our users were complaing that they weren't seeing
updates for minutes in shared docs as folks were on conference calls and
updating them in realtime, Come to find out they were getting served up a
copy of the doc from a stateside location instead of a datacenter closer to
them since they had a US based IP.   Google maps would also default to the
US instead of the country where they were as well.  So yes their GeoIP
database is usally very accurate.


On Thu, Jan 11, 2018 at 11:14 AM, Christopher Cashell <topher-olug at zyp.org>

> On Thu, Jan 11, 2018 at 10:09 AM, Lou Duchez <lou at paprikash.com> wrote:
> > I found a list of IP blocks assigned to the United States:
> >
> > http://www.ipdeny.com/ipblocks/data/aggregated/us-aggregated.zone
> >
> > Anyone finding that they're NOT on this list?  I find that my various IPs
> > are all on here.  There's all sorts of firewally goodness I can use this
> > list for, assuming it's reliable.  (Assuming they're telling the truth,
> > they update their list on a daily basis.)
> >
> There are lots of pretty good GeoIP databases, but be aware that none of
> them are going to be perfect, and IP assignment and route advertisements
> change regularly.  They can be very useful, but if you rely on them, or
> expect them to be correct, or make decisions such as traffic blocking based
> on them, you may run into trouble.  At the least, I would recommend not
> taking hard action beyond very specific subnets that are well known to be
> assigned to certain countries.
> It wasn't that long ago that I saw a chunk of public IP space at work that
> Google believed was from the Philippines.  Accessing Google through that
> block caused us to get redirected to http://www.google.com.ph, even though
> the actual Internet connection point was in Denver.  And Google does a
> better job than most at maintaining GeoIP information.
> --
> Christopher
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Trent Melcher
*trentm at trackd.run*

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