# Device Identifiers

Chartboost identifiers explained: expected formats, use, and support.

## Identifier for Advertising

IFA is also referred to as IDFA. They are the same thing.

|Sent in the field|Format|Platform|Supported by|
|--|--|--|--|
|`ifa`|{::nomarkdown}<ul><li>Hexadecimal representation of the IFA data from the device</li><li>Dashes are not inserted</li><li>32 characters long</li></ul>{:/}|iOS|{::nomarkdown}<ul><li>All Chartboost iOS SDKs</li><li>Callbacks</li><li>Server-to-Server integration</li></ul>{:/}|



### How Do I Get My IFA?

1.  Link  **AdSupport.framework**  (Build Phases -> Link Binary With Libraries)
2.  Add these lines of code to an app and run it on an iOS device you'll see the IFA printed in the log:


```
// Import these  
 
#import <CommonCrypto/CommonDigest.h>  
#import <AdSupport/AdSupport.h>  
  
// Print IFA (Identifier for Advertising) in Output section. Add to applicationDidBecomeActive. iOS 6+ devices only. NSString* ifa = [[[NSClassFromString(@"ASIdentifierManager") sharedManager] advertisingIdentifier] UUIDString];ifa = [[ifa stringByReplacingOccurrencesOfString:@"-" withString:@""] lowercaseString];NSLog(@"IFA: %@",ifa);
```

  

Alternatively, you may be able to find your device IFA by using a third-party app called  [The Identifiers](https://itunes.apple.com/us/app/the-identifiers/id564618183?mt=8).

**Does the use of the Chartboost SDK comply with Apple's IDFA policies?**The Chartboost SDK respects the  **Limit Ad Tracking**  setting and Apple's limitations on the usage of IDFA to:

1.  Serve advertisements within an app
2.  Attribute an app installation to a previously served advertisement
3.  Attribute an action taken within an app to a previously served advertisement

Please continue using the Chartboost SDK with confidence, and for any questions or concerns,  [contact us](/en/support/contact-us/).




## Google Advertising ID (GAID)

|Sent in the field|Format|Platform|Supported by|
|--|--|--|--|
|`gaid`|{::nomarkdown}<ul><li>32 characters, plus 4 dashes (e.g. <code>e4fe9bde-caa0-47b6-908d-ffba3fa184f2</code>)</li><li>Lower-case letters and numbers</li></ul>{:/}|Android|{::nomarkdown}<ul><li>All Chartboost Android SDKs</li><li>Server-to-Server integration</li><li>Callbacks</li></ul>{:/}|



### How do I get my GAID?

-   On your Android device, open the  **Google Settings**  app.
-   Select  **Ads**.
-   Your advertising ID appears at the bottom.  


![](/assets/images/articles/2023_advertising_tools_deviceidentifiers_001.jpg)




## UDID

|Sent in the field|Format|Platform|Supported by|
|--|--|--|--|
|`uuid`|{::nomarkdown}<ul><li>Should not be hashed or manipulated in any way</li><li>36 characters long</li></ul>{:/}|iOS Only|{::nomarkdown}<ul><li>Server-to-Server integration</li><li>Callbacks</li></ul>{:/}|