The following table shows a breakdown of the accuracy of GeoIP City on a city level by country for selected countries. The GeoIP databases are 99.8% accurate at a country level. We arrive at the accuracy figure by checking known IP address and location pairs against our database. We obtain the known IP location pairs from sites that ask the web visitor to provide their geographic location. The geographic location along with the web visitor's IP Address is forwarded to us.

While only larger countries are shown below, the GeoIP City database covers cities worldwide.

It is suggested that clients stay as up to date as possible with the databases, as their accuracy erodes over time as IP addresses shift location. As a database gets more and more out of date, it looses accuracy at a rate of approximately 1.5% per month. So, for example, our current GeoIP City database is 83% accurate for the US, but last month's release is (for current data) only 81.5% accurate, and a six-month old version is only 74% accurate. These databases can still be useful for testing historic data, since they were 83% accurate at the time they were first released, but for current use, the most recent database is suggested.

Table Terms:

Correctly Resolved Within 25 Miles of True Location: refers to the IP addresses that are correctly resolved within 25 miles of the actual city. The second number in parenthesis refers to the percentage of IP addresses that are correctly resolved if excluding data not covered on a city level.

Incorrectly Resolved More Than 25 Miles From True Location: refers to IP addresses that were incorrectly resolved by more than 25 miles of the actual city.

Not Covered on a City Level: refers to the percentage of the data of select country that does not contain city information. We leave these data ranges without city information to prevent false positives. The city information is not available for AOL IP address or when Internet Service Providers (ISPs) route traffic through proxies thus masking the originating location.

Updated November 19th, 2008

Countries	Correctly Resolved Within 25 Miles of True Location	Incorrectly Resolved More Than 25 Miles from True Location	Not Covered on a City Level
Argentina	67% (67%)	32%	1%
Australia	62% (63%)	37%	1%
Austria	79% (80%)	20%	1%
Bahamas	92% (92%)	7%	1%
Bangladesh	84% (85%)	15%	1%
Belgium	90% (90%)	9%	1%
Bolivia	60% (61%)	39%	1%
Brazil	65% (71%)	27%	8%
Bulgaria	76% (77%)	23%	1%
Canada	83% (83%)	16%	1%
Chile	73% (73%)	26%	1%
China	71% (73%)	26%	3%
Colombia	67% (68%)	32%	1%
Costa Rica	88% (88%)	11%	1%
Cote D'Ivoire	93% (94%)	6%	1%
Croatia	79% (80%)	20%	1%
Cyprus	84% (85%)	15%	1%
Czech Republic	77% (77%)	22%	1%
Denmark	83% (84%)	16%	1%
Ecuador	78% (78%)	21%	1%
Egypt	80% (82%)	18%	2%
El Salvador	92% (92%)	7%	1%
Estonia	83% (84%)	16%	1%
Finland	81% (82%)	18%	1%
France	66% (67%)	32%	2%
French Polynesia	83% (83%)	16%	1%
Georgia	93% (94%)	6%	1%
Germany	76% (77%)	22%	2%
Greece	65% (66%)	33%	2%
Guadeloupe	92% (93%)	7%	1%
Honduras	75% (77%)	23%	2%
Hong Kong	92% (93%)	7%	1%
Hungary	83% (83%)	16%	1%
Iceland	82% (83%)	17%	1%
India	70% (70%)	29%	1%
Indonesia	70% (70%)	29%	1%
Ireland	70% (70%)	29%	1%
Israel	68% (70%)	30%	2%
Italy	62% (64%)	36%	2%
Japan	72% (77%)	21%	7%
Jordan	78% (89%)	10%	12%
Kazakhstan	85% (86%)	14%	1%
Kenya	74% (77%)	22%	4%
Korea, Republic of	78% (80%)	19%	3%
Latvia	84% (84%)	15%	1%
Lebanon	83% (88%)	12%	5%
Lithuania	80% (80%)	19%	1%
Luxembourg	94% (94%)	5%	1%
Malaysia	66% (66%)	33%	1%
Malta	93% (97%)	3%	4%
Mexico	72% (74%)	26%	2%
Morocco	42% (54%)	36%	22%
Mozambique	70% (74%)	24%	6%
Netherlands	85% (85%)	14%	1%
New Caledonia	77% (79%)	20%	3%
New Zealand	68% (68%)	31%	1%
Nicaragua	77% (77%)	22%	1%
Nigeria	40% (56%)	32%	28%
Norway	79% (79%)	20%	1%
Pakistan	62% (62%)	37%	1%
Peru	86% (86%)	13%	1%
Philippines	64% (65%)	35%	1%
Poland	66% (67%)	33%	1%
Portugal	73% (73%)	26%	1%
Qatar	95% (95%)	4%	1%
Romania	74% (74%)	25%	1%
Russian Federation	82% (83%)	17%	1%
Saudi Arabia	47% (51%)	45%	8%
Singapore	93% (94%)	6%	1%
Slovakia	56% (57%)	43%	1%
Slovenia	83% (84%)	16%	1%
South Africa	67% (68%)	32%	1%
Spain	77% (78%)	21%	2%
Sri Lanka	71% (71%)	28%	1%
Sweden	80% (81%)	19%	1%
Switzerland	67% (68%)	32%	1%
Taiwan	83% (83%)	16%	1%
Thailand	77% (78%)	22%	1%
Trinidad and Tobago	92% (93%)	6%	2%
Tunisia	44% (55%)	36%	20%
Turkey	73% (73%)	26%	1%
Ukraine	70% (71%)	28%	2%
United Arab Emirates	82% (84%)	15%	3%
United Kingdom	59% (64%)	34%	7%
United States	83% (84%)	15%	2%
Uruguay	68% (68%)	31%	1%
Venezuela	63% (63%)	36%	1%