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How are people tracked?
Lead Liaison uses both cookies, IP addresses, and website client data (browser) to uniquely identify visitors. When cookies are allowed, the unique identifier becomes the email address. Past, current, and future visitors are merged together using the email address. When cookies are not allowed (blocked), the unique identifier is the visitor's IP address concatenated with the header value of "HTTP_USER_AGENT" from the user's browser.
How often is the data updated?
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Lead Liaison tests the accuracy of the geolocation data on a periodic basis. In our recent tests, the databases were 99.8% accurate on a country level, 90% accurate on a state level in the US, and 84% accurate for cities in the US within a 31 mile (50 kilometer) radius. Below are additional data points on geolocation accuracy. Please contact . Accuracy is determined by the location we return falling within the selected distance of the true location of the IP address. In other words, taking the 3rd data point below, 84% of the locations we return are within 31 miles of the actual location of the end-user.
Contact your Lead Liaison representative if you're seeking additional country data points for countries other than the US.
| Country | Data TypePoint | Range | Accuracy | ||||
|---|---|---|---|---|---|---|---|
| United States | City | 250km / 155.3 miles | 93% | ||||
| United States | City | 100km / 62.1 miles | 89% | ||||
| United States | City | 50km / 31 miles | 84% | ||||
| United States | City | 25km / 15.5 miles | 75% | ||||
| United States | City | 10km / 6.21 miles | 57% | ||||
| United States | City | Exact | 50% | ||||
| United States | Postal/Zip Code | Exact | 33% |
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How much of the IP address space do you cover?
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