When it comes to identifying mobile platforms like Android and iOS, the traditional methods have evolved. While Android previously used Android_ID and UDID (now deprecated), it now relies on IFA. In addition, Android OS also utilizes other system identifiers such as IMEI, MEID, ESN for equipment, and IMSI from the SIM and WLAN MAC address for subscribers.
For mobile web usage, third-party cookies are commonly employed online. These cookies work effectively on Android devices, but in iOS devices, they are disabled by default in safari browser. To work around this limitation, ad networks can utilize invisible iframes to write cookies via the website visited by users, creating a first-party cookie-like appearance.
Another method involves gathering information disclosed by the browser itself to create a unique fingerprint for each device. This technique varies depending on whether javascript is enabled in the browser and how extensively the consumer uses it, with an accuracy rate of over 94% achievable.
Alternatively, domain-specific persistent identifiers can be relied upon for tracking purposes. (Original Source)
Blue Cava offers a platform for device fingerprinting to deliver tailored online content and identify devices exhibiting positive or negative behavior. For those interested in utilizing this service, BlueCava provides JavaScript client-side APIs for greater flexibility and integration options. To integrate, simply insert the JavaScript into the HTML of the end-user's page, allowing it to communicate with BlueCava servers.