{"id":58450,"date":"2026-05-21T18:55:20","date_gmt":"2026-05-21T15:55:20","guid":{"rendered":"https:\/\/affisemmp.com\/?post_type=glossary-term&#038;p=58450"},"modified":"2026-09-10T18:33:27","modified_gmt":"2026-09-10T15:33:27","slug":"advertiser-id-idfa-gaid","status":"publish","type":"glossary-term","link":"https:\/\/affisemmp.com\/cn\/glossary-term\/advertiser-id-idfa-gaid\/","title":{"rendered":"Advertiser ID (IDFA\/GAID)"},"content":{"rendered":"<h2><strong><span class=\"\">Definion of Advertiser ID<\/span><\/strong><\/h2>\n<p class=\"ds-markdown-paragraph\"><span class=\"\">Advertiser IDs are unique, resettable device identifiers used by mobile measurement partners (MMPs) to attribute app installs, in-app events, and revenue to their originating ad campaigns.<\/span><span class=\"\"> On iOS, this identifier is called the <\/span><span class=\"\">Identifier for Advertisers (IDFA)<\/span><span class=\"\">. On Android, it is known as the <\/span><span class=\"\">Google Advertising ID (GAID)<\/span><span class=\"\">, or sometimes the <\/span><span class=\"\">Android Advertising ID (AAID)<\/span><span class=\"\">.<\/span><\/p>\n<p class=\"ds-markdown-paragraph\"><span class=\"\">These identifiers are the technical backbone of deterministic mobile attribution \u2014 they allow platforms like Affise MMP to match a user\u2019s ad click or impression to a subsequent install or in-app action with a high degree of certainty.<\/span><\/p>\n<h2><strong>Types of Advertiser IDs<\/strong><\/h2>\n<p class=\"ds-markdown-paragraph\"><span class=\"\">There are two primary types of advertiser IDs:<\/span><\/p>\n<div class=\"ds-scroll-area ds-scroll-area--show-on-focus-within ds-scroll-area--enabled _1210dd7 c03cafe9\">\n<table>\n<thead>\n<tr>\n<th><span class=\"\">Platform<\/span><\/th>\n<th><span class=\"\">Identifier<\/span><\/th>\n<th><span class=\"\">Format<\/span><\/th>\n<th><span class=\"\">Introduced<\/span><\/th>\n<\/tr>\n<\/thead>\n<tbody>\n<tr>\n<td><strong><span class=\"\">iOS (Apple)<\/span><\/strong><\/td>\n<td><strong><span class=\"\">IDFA<\/span><\/strong><span class=\"\">\u00a0(Identifier for Advertisers)<\/span><\/td>\n<td><span class=\"\">Uppercase alphanumeric (e.g.,\u00a0<\/span><code>EA7583CD-A667-48BC-B806-42ECB2B48606<\/code><span class=\"\">)<\/span><\/td>\n<td><span class=\"\">2012<\/span><\/td>\n<\/tr>\n<tr>\n<td><strong><span class=\"\">Android (Google)<\/span><\/strong><\/td>\n<td><strong><span class=\"\">GAID<\/span><\/strong><span class=\"\">\u00a0(Google Advertising ID), also known as AAID<\/span><\/td>\n<td><span class=\"\">Lowercase alphanumeric (e.g.,\u00a0<\/span><code>38400000-8cf0-11bd-b23e-10b96e40000d<\/code><span class=\"\">)<\/span><\/td>\n<td><span class=\"\">2013<\/span><\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<\/div>\n<p class=\"ds-markdown-paragraph\"><span class=\"\">Both identifiers work in fundamentally the same way \u2014 they provide a way to identify a device for advertising purposes while giving users control over their privacy<\/span><span class=\"\">. The key visual difference is case sensitivity:\u00a0<\/span><strong><span class=\"\">IDFA uses uppercase letters, while GAID uses lowercase<\/span><\/strong><span class=\"\">.<\/span><\/p>\n<hr \/>\n<h2><span class=\"\">Why Advertiser IDs Matter in Mobile Marketing<\/span><\/h2>\n<p class=\"ds-markdown-paragraph\"><span class=\"\">Advertiser IDs are the\u00a0<\/span><strong><span class=\"\">cornerstone of mobile attribution<\/span><\/strong><span class=\"\">. Without them, mobile marketers would have no reliable way to:<\/span><\/p>\n<ul>\n<li>\n<p class=\"ds-markdown-paragraph\"><strong><span class=\"\">Track which ads drive app installs<\/span><\/strong><span class=\"\">\u00a0\u2014 By matching the device\u2019s advertiser ID against click data, MMPs can determine exactly which campaign led to an install<\/span><span class=\"\">.<\/span><\/p>\n<\/li>\n<li>\n<p class=\"ds-markdown-paragraph\"><strong><span class=\"\">Measure campaign performance<\/span><\/strong><span class=\"\">\u00a0\u2014 Advertiser IDs allow marketers to see which channels, creatives, and partners deliver the highest-value users<\/span><span class=\"\">.<\/span><\/p>\n<\/li>\n<li>\n<p class=\"ds-markdown-paragraph\"><strong><span class=\"\">Optimize ad spend<\/span><\/strong><span class=\"\">\u00a0\u2014 Understanding which campaigns drive conversions enables real-time budget shifting to maximize Return on Ad Spend (ROAS)<\/span><span class=\"\">.<\/span><\/p>\n<\/li>\n<li>\n<p class=\"ds-markdown-paragraph\"><strong><span class=\"\">Detect ad fraud<\/span><\/strong><span class=\"\">\u00a0\u2014 If an install arrives without a corresponding valid click tied to an advertiser ID, it can be flagged as fraudulent<\/span><span class=\"\">.<\/span><\/p>\n<\/li>\n<li>\n<p class=\"ds-markdown-paragraph\"><strong><span class=\"\">Track in-app events<\/span><\/strong><span class=\"\">\u00a0\u2014 Beyond the install, advertiser IDs enable attribution of purchases, subscriptions, level-ups, and other in-app events back to the original ad source<\/span><span class=\"\">.<\/span><\/p>\n<\/li>\n<\/ul>\n<p class=\"ds-markdown-paragraph\"><span class=\"\">In short,\u00a0<\/span><strong><span class=\"\">advertiser IDs are what make mobile attribution possible<\/span><\/strong><span class=\"\">\u00a0\u2014 they are the technical link between a user\u2019s ad exposure and their subsequent actions inside an app.<\/span><\/p>\n<hr \/>\n<h2><span class=\"\">How Advertiser IDs Work with Affise MMP<\/span><\/h2>\n<p class=\"ds-markdown-paragraph\"><span class=\"\">Affise MMP (Mobile Measurement Partner) uses advertiser IDs as a core component of its attribution engine. Here\u2019s how the process works step by step:<\/span><\/p>\n<h3><span class=\"\">1. The User Clicks an Ad<\/span><\/h3>\n<p class=\"ds-markdown-paragraph\"><span class=\"\">A user clicks on a mobile ad. This click passes through a\u00a0<\/span><strong><span class=\"\">unique tracking URL<\/span><\/strong><span class=\"\">\u00a0generated by Affise MMP, which logs the source, campaign ID, and timestamp<\/span><span class=\"\">.<\/span><\/p>\n<h3><span class=\"\">2. The User Installs the App<\/span><\/h3>\n<p class=\"ds-markdown-paragraph\"><span class=\"\">The user is redirected to the Apple App Store or Google Play Store and downloads the app<\/span><span class=\"\">.<\/span><\/p>\n<h3><span class=\"\">3. The SDK Initializes<\/span><\/h3>\n<p class=\"ds-markdown-paragraph\"><span class=\"\">When the user opens the app for the first time, the\u00a0<\/span><strong><span class=\"\">Affise MMP SDK<\/span><\/strong><span class=\"\">\u00a0(which the developer previously integrated) is initialized<\/span><span class=\"\">. The SDK captures:<\/span><\/p>\n<ul>\n<li>\n<p class=\"ds-markdown-paragraph\"><span class=\"\">The device\u2019s advertiser ID (<\/span><strong><span class=\"\">IDFA on iOS<\/span><\/strong><span class=\"\">\u00a0or\u00a0<\/span><strong><span class=\"\">GAID on Android<\/span><\/strong><span class=\"\">)<\/span><\/p>\n<\/li>\n<li>\n<p class=\"ds-markdown-paragraph\"><span class=\"\">The install event<\/span><\/p>\n<\/li>\n<li>\n<p class=\"ds-markdown-paragraph\"><span class=\"\">Timestamp, IP address, and user agent<\/span><\/p>\n<\/li>\n<\/ul>\n<h3><span class=\"\">4. Attribution Matching<\/span><\/h3>\n<p class=\"ds-markdown-paragraph\"><span class=\"\">Affise MMP compares the incoming install data against the click data stored from Step 1<\/span><span class=\"\">. The key matching criteria include:<\/span><\/p>\n<ul>\n<li>\n<p class=\"ds-markdown-paragraph\"><strong><span class=\"\">Device identifiers<\/span><\/strong><span class=\"\">\u00a0(IDFA\/GAID matching \u2014 deterministic attribution)<\/span><\/p>\n<\/li>\n<li>\n<p class=\"ds-markdown-paragraph\"><span class=\"\">IP address, user agent, and OS version (probabilistic fingerprinting when the ID is unavailable)<\/span><\/p>\n<\/li>\n<li>\n<p class=\"ds-markdown-paragraph\"><span class=\"\">Timestamp windows (e.g., last click within a 7-day window)<\/span><\/p>\n<\/li>\n<\/ul>\n<h3><span class=\"\">5. Conversion Recorded<\/span><\/h3>\n<p class=\"ds-markdown-paragraph\"><span class=\"\">If the click and install match within the predefined time window, a conversion is recorded.<\/span><\/p>\n<h3><span class=\"\">6. Postback Sent<\/span><\/h3>\n<p class=\"ds-markdown-paragraph\"><span class=\"\">Affise MMP sends a\u00a0<\/span><strong><span class=\"\">postback<\/span><\/strong><span class=\"\">\u00a0notification to the ad network, confirming the install was successful<\/span><span class=\"\">.<\/span><\/p>\n<hr \/>\n<h2><span class=\"\">Privacy Changes: The End of the IDFA Era<\/span><\/h2>\n<p class=\"ds-markdown-paragraph\"><span class=\"\">The mobile advertising landscape has undergone a dramatic shift in recent years, driven by privacy regulations and platform policy changes.<\/span><\/p>\n<h3><span class=\"\">iOS 14.5 and App Tracking Transparency (ATT)<\/span><\/h3>\n<p class=\"ds-markdown-paragraph\"><span class=\"\">With the release of\u00a0<\/span><strong><span class=\"\">iOS 14.5 in April 2021<\/span><\/strong><span class=\"\">, Apple introduced\u00a0<\/span><strong><span class=\"\">App Tracking Transparency (ATT)<\/span><\/strong><span class=\"\">\u00a0\u2014 a framework requiring apps to obtain\u00a0<\/span><strong><span class=\"\">explicit user consent<\/span><\/strong><span class=\"\">\u00a0before accessing the IDFA<\/span><span class=\"\">. Key implications:<\/span><\/p>\n<ul>\n<li>\n<p class=\"ds-markdown-paragraph\"><span class=\"\">Users are\u00a0<\/span><strong><span class=\"\">opted-out by default<\/span><\/strong><\/p>\n<\/li>\n<li>\n<p class=\"ds-markdown-paragraph\"><span class=\"\">Apps must present a tracking prompt and users must select \u201cAllow Tracking\u201d to grant access<\/span><\/p>\n<\/li>\n<li>\n<p class=\"ds-markdown-paragraph\"><span class=\"\">Users can configure opt-ins and opt-outs per app in Settings<\/span><\/p>\n<\/li>\n<li>\n<p class=\"ds-markdown-paragraph\"><span class=\"\">Users can toggle off \u201cAllow Apps to Request to Track\u201d entirely, preventing the prompt from appearing<\/span><\/p>\n<\/li>\n<\/ul>\n<p class=\"ds-markdown-paragraph\"><span class=\"\">As a result,\u00a0<\/span><strong><span class=\"\">IDFA availability has dropped significantly<\/span><\/strong><span class=\"\">\u00a0\u2014 industry reports suggest opt-in rates vary by region and vertical, generally ranging from\u00a0<\/span><strong><span class=\"\">30% to 50%<\/span><\/strong><span class=\"\">\u00a0<\/span><span class=\"\">.<\/span><\/p>\n<h3><span class=\"\">Android Privacy Changes<\/span><\/h3>\n<p class=\"ds-markdown-paragraph\"><span class=\"\">Google has followed suit with its own privacy initiatives:<\/span><\/p>\n<ul>\n<li>\n<p class=\"ds-markdown-paragraph\"><span class=\"\">From\u00a0<\/span><strong><span class=\"\">Android 12<\/span><\/strong><span class=\"\">, the GAID is zeroed out for users who opt-out of ad personalization<\/span><\/p>\n<\/li>\n<li>\n<p class=\"ds-markdown-paragraph\"><span class=\"\">From\u00a0<\/span><strong><span class=\"\">Android 14<\/span><\/strong><span class=\"\">, users can customize ad settings or completely remove the GAID<\/span><\/p>\n<\/li>\n<li>\n<p class=\"ds-markdown-paragraph\"><strong><span class=\"\">Privacy Sandbox on Android<\/span><\/strong><span class=\"\">, expected for full rollout in 2025, will further reduce reliance on the GAID<\/span><\/p>\n<\/li>\n<\/ul>\n<h3><span class=\"\">The Impact on Mobile Attribution<\/span><\/h3>\n<p class=\"ds-markdown-paragraph\"><span class=\"\">These changes have made\u00a0<\/span><strong><span class=\"\">deterministic tracking<\/span><\/strong><span class=\"\">\u00a0(relying solely on IDFA\/GAID) increasingly unreliable. To address this, Affise MMP supports several alternative approaches:<\/span><\/p>\n<ul>\n<li>\n<p class=\"ds-markdown-paragraph\"><strong><span class=\"\">SKAdNetwork (SKAN)<\/span><\/strong><span class=\"\">\u00a0\u2014 Apple\u2019s privacy-preserving framework that provides aggregated, delayed attribution reports rather than user-level data<\/span><\/p>\n<\/li>\n<li>\n<p class=\"ds-markdown-paragraph\"><strong><span class=\"\">AdAttributionKit (AAK)<\/span><\/strong><span class=\"\">\u00a0\u2014 Apple\u2019s newer attribution framework introduced at WWDC 2024<\/span><\/p>\n<\/li>\n<li>\n<p class=\"ds-markdown-paragraph\"><strong><span class=\"\">Probabilistic modeling and fingerprinting<\/span><\/strong><span class=\"\">\u00a0\u2014 Analyzing IP addresses, device type, and OS version to match users when deterministic identifiers are unavailable<\/span><\/p>\n<\/li>\n<li>\n<p class=\"ds-markdown-paragraph\"><strong><span class=\"\">Privacy Sandbox<\/span><\/strong><span class=\"\">\u00a0\u2014 Google\u2019s evolving privacy-preserving alternative to traditional device tracking<\/span><\/p>\n<\/li>\n<\/ul>\n<hr \/>\n<h2><span class=\"\">How Affise MMP Handles the New Privacy Landscape<\/span><\/h2>\n<p class=\"ds-markdown-paragraph\"><span class=\"\"><a href=\"https:\/\/affisemmp.com\/\">Affise MMP<\/a> has proactively adapted to these privacy changes, ensuring marketers can continue to measure campaign performance even as advertiser ID availability declines:<\/span><\/p>\n<div class=\"ds-scroll-area ds-scroll-area--show-on-focus-within ds-scroll-area--enabled _1210dd7 c03cafe9\">\n<table>\n<thead>\n<tr>\n<th><span class=\"\">Challenge<\/span><\/th>\n<th><span class=\"\">Affise MMP Solution<\/span><\/th>\n<\/tr>\n<\/thead>\n<tbody>\n<tr>\n<td><span class=\"\">Low IDFA opt-in rates<\/span><\/td>\n<td><strong><span class=\"\">SKAdNetwork (SKAN)<\/span><\/strong><span class=\"\">\u00a0and\u00a0<\/span><strong><span class=\"\">AdAttributionKit (AAK)<\/span><\/strong><span class=\"\">\u00a0support for aggregated iOS attribution<\/span><\/td>\n<\/tr>\n<tr>\n<td><span class=\"\">GAID limitations on Android<\/span><\/td>\n<td><strong><span class=\"\">Privacy Sandbox<\/span><\/strong><span class=\"\">\u00a0readiness and probabilistic attribution<\/span><\/td>\n<\/tr>\n<tr>\n<td><span class=\"\">No advertiser ID available<\/span><\/td>\n<td><strong><span class=\"\">Probabilistic fingerprinting<\/span><\/strong><span class=\"\">\u00a0using IP, device type, and OS version<\/span><\/td>\n<\/tr>\n<tr>\n<td><span class=\"\">Need for privacy-compliant tracking<\/span><\/td>\n<td><strong><span class=\"\">Server-to-server (S2S) attribution<\/span><\/strong><span class=\"\">\u00a0and\u00a0<\/span><strong><span class=\"\">API-based tracking<\/span><\/strong><\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<\/div>\n<p class=\"ds-markdown-paragraph\"><span class=\"\">Affise MMP acts as a\u00a0<\/span><strong><span class=\"\">neutral, unbiased layer<\/span><\/strong><span class=\"\">\u00a0between advertisers and ad networks, ensuring accurate tracking regardless of the underlying identifier availability<\/span><span class=\"\">.<\/span><\/p>\n<hr \/>\n<h2><span class=\"\">Best Practices for Advertiser ID Tracking with Affise MMP<\/span><\/h2>\n<p class=\"ds-markdown-paragraph\"><span class=\"\">To maximize tracking accuracy and campaign performance in the current privacy-first environment, follow these best practices:<\/span><\/p>\n<h3><span class=\"\">1. Implement Proper Consent Management<\/span><\/h3>\n<p class=\"ds-markdown-paragraph\"><span class=\"\">For iOS apps, integrate the\u00a0<\/span><strong><span class=\"\">App Tracking Transparency framework<\/span><\/strong><span class=\"\">\u00a0and present a clear value proposition for why users should enable tracking<\/span><span class=\"\">.<\/span><\/p>\n<h3><span class=\"\">2. Configure Fallback Measurement Methods<\/span><\/h3>\n<p class=\"ds-markdown-paragraph\"><span class=\"\">Set up\u00a0<\/span><strong><span class=\"\">SKAdNetwork<\/span><\/strong><span class=\"\">\u00a0for iOS attribution and prepare for\u00a0<\/span><strong><span class=\"\">Privacy Sandbox<\/span><\/strong><span class=\"\">\u00a0integration on Android<\/span><span class=\"\">. Ensure Affise MMP can handle both deterministic device ID matching and probabilistic modeling<\/span><span class=\"\">.<\/span><\/p>\n<h3><span class=\"\">3. Test Across Permission Scenarios<\/span><\/h3>\n<p class=\"ds-markdown-paragraph\"><span class=\"\">Verify that your implementation works properly for both\u00a0<\/span><strong><span class=\"\">opted-in and opted-out users<\/span><\/strong><span class=\"\">.<\/span><\/p>\n<h3><span class=\"\">4. Use Affise MMP\u2019s Full Toolkit<\/span><\/h3>\n<p class=\"ds-markdown-paragraph\"><span class=\"\">Leverage Affise MMP\u2019s comprehensive attribution capabilities, including:<\/span><\/p>\n<ul>\n<li>\n<p class=\"ds-markdown-paragraph\"><strong><span class=\"\">Deterministic attribution<\/span><\/strong><span class=\"\">\u00a0when IDFA\/GAID is available<\/span><\/p>\n<\/li>\n<li>\n<p class=\"ds-markdown-paragraph\"><strong><span class=\"\">Probabilistic attribution<\/span><\/strong><span class=\"\">\u00a0when identifiers are unavailable<\/span><\/p>\n<\/li>\n<li>\n<p class=\"ds-markdown-paragraph\"><strong><span class=\"\">Postback integration<\/span><\/strong><span class=\"\">\u00a0with ad networks for real-time campaign optimization<\/span><\/p>\n<\/li>\n<\/ul>\n<h3><span class=\"\">5. Monitor Opt-in Rates<\/span><\/h3>\n<p class=\"ds-markdown-paragraph\"><span class=\"\">Track your IDFA\/GAID opt-in rates across regions and verticals to understand the impact on your attribution coverage and adjust your measurement strategy accordingly<\/span><span class=\"\">.<\/span><\/p>\n","protected":false},"template":"","meta":{"_acf_changed":false,"content-type":"","inline_featured_image":false},"class_list":["post-58450","glossary-term","type-glossary-term","status-publish","hentry"],"acf":[],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v28.2 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>Advertiser ID (IDFA \/ GAID) Definition | Affise Glossary<\/title>\n<meta name=\"description\" content=\"What is an Advertiser ID? 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