By default, Amplitude tracks the user properties listed in the table below automatically, via client-side SDKs. All these properties will be prefixed with 
whenever you encounter them in Amplitude. (You can configure Amplitude's SDKs to disable automatic tracking of these properties, if you prefer.)
Amplitude uses the collected IP address to determine a user's location properties (City , Country , Region , and DMA ) using the MaxMind database. MaxMind is widely accepted as the most reliable digital mapping source.
In Amplitude charts, if you choose to segment by device ID, event ID, latitude, longitude, server upload time, session ID, user ID, or ID, you'll have to supply the exact values you're looking yourself. Additionally, you will not be able to group by event ID, latitude, longitude, server upload time, or ID.
NOTE: If you’re sending data server-side instead of using an SDK, Amplitude cannot track these user properties automatically. You must instead set these properties explicitly.
| Property | Value Definition |
|---|---|
| Cohort
character varying (256) |
(Enterprise only) Behavioral cohort name.
"Cohort Name" |
| Country
character varying (256) |
Country of the event. This is pulled using GeoIP.
"United States" |
| City
character varying (256) |
City of the event. This is pulled using GeoIP.
"San Francisco" |
| Region
character varying (256) |
Region (e.g. state, province, county) of the event. This is pulled using GeoIP.
"California" |
| DMA
character varying (256) |
Designated Market Area (DMA) of the event. This is pulled using GeoIP.
"San Francisco-Oakland-San Jose, CA" |
| Language
character varying (256) |
Language of the device.
"English" |
| Paying
character varying (256) |
Paying is set to null for all users by default. The property value changes to "true" at the time of the user's first revenue event (or first verified revenue event, if validation is on). Once a property is set to "true", it will not change. You can manually change this value via Amplitude's Identify API. "true", null/none |
| Platform
character varying (256) |
Platform of the product.
"iOS", "Android", or "Web" |
| OS
character varying (256) |
Operating system of the device.
"ios 9.1", "Chrome 46" |
| Device Family
character varying (256) |
Family of the device.
"Apple iPhone", "Samsung Galaxy Tablet", "Windows" |
| Device Type
character varying (256) |
Specific type of the device.
"Apple iPhone 6", "Samsung Galaxy Note 4", "Windows" Events tracked by Amplitude's Javascript SDK will display device family values e.g. "Apple iPhone" etc. This SDK does not track the specific type of device. |
| Carrier
character varying (256) |
The device's carrier.
"Verizon" |
| Start version
character varying (256) |
First version of your application identified for the user. Please note that this might change if the user reinstalls the app.
"1.0.0" |
| Version
character varying (256) |
Current version of your application identified for the user.
"1.0.0" |
| Library
character varying (256) |
Library used to send the event.
"amplitude-ios/3.2.1", "http/1.0" |
| IP Address
character varying (256) |
IP address of the user.
"127.0.0.1" |
| Device ID
character varying (256) |
The device ID of the user.
"C8F9E604-F01A-4BD9-95C6-8E5357DF265D" |
| Event ID
character varying (256) |
The event ID associated with the event.
"5" |
| Latitude
character varying (256) |
The latitude of the user.
"42.3296" |
| Longitude
character varying (256) |
The longitude of the user.
"-88.9995" |
| Session ID
character varying (256) |
The session ID associated with the event.
"1487030360349" |
| User ID
character varying (256) |
The user ID of the user. This should be a unique user identifier of the user and should never change for the same user, e.g. a hashed string of the user's username. This is explicitly set by the customer; Amplitude does not auto-populate this field. "abc123" |
| ID
character varying (256) |
The Amplitude ID of the user.
"16342233234" |