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Comment by egeozcan | Hacker News Reader

That makes it only more interesting. However, I assume, IP-based location isn't that granular?

It's very surprisingly granular. I logged dropped packets from my router's firewall for a week and looked up the origin locations with geoip for fun. Just plugging in the coordinates to google maps would zoom directly in on peoples' houses (sometimes in the middle of nowhere). I'm not sure it's 100% accurate, of course, but it sure seemed specific.

On the other hand, my ip "resolves" via geoip to a city about 500 kilometers away so I guess it depends on what database you use and what country.

The city it resolves to is where my isp has their HQ.

I tried checking my current ip. It points me to some hotel in Helsinki. I'm about 500 km away from there.

The actual data source will provide a country, state or sometimes even city and zipcode. Then whatever tool you're using to map drops a pin in the middle of that region. If you zoom in, you get whatever happens to be at the geographic center of whatever the mapping tool (probably Google Maps) thinks is the center. eg if it says "United States" and no other data, you get some random ass place in the middle of Kansas. Sometimes there can be more specific data, but just because you can keep zooming in doesn't mean that that's actually where it is

You're describing GeoIP derived from "public" information sources such as the physical address of the assigned entity or the location information provided to the registrar by the block owner.

However, there is a different kind of GeoIP that has the potential to be much more specific as to the location, based on a join between Internet traffic and transactions that target a specific location. e.g. when you purchase a physical item from an online vendor, with your house as the delivery address, they now have both your IP and location. Obviously for this to work it depends on a) the IP address remaining the same for some period of time and b) sharing of the necessary information to allow the join. afaik both are often true.

This just means that it's precise, not necessarily accurate.

In US (or is it just Comcast) - it is exact!

Seems Comcast maps IP (which they issue) to postal address to exact Geo coordinate.

Basically that and... I'd say when you don't share the location, they only have what's available publicly from GeoIP (via ISPs). Wen you do, your user agent actively tries to give them the best possible results (using GPS or anything else), that's the way I would put it.

Try normal Geo-IP (Maxmind) and it will show the local telco exchange.

I am sure the NSA does better but Kazakhstan? I have been inside one of their embassies to be shocked that they were watching the news on a black and white CRT TV!!!

Probably because they got sick of embassy staff stealing the TVs they kept buying for them. 8)

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