What is the iid cookie?
The iid cookie is set by InMobi to assign a unique identifier to users for programmatic advertising and cross-site tracking.
Table of Contents
About the iid cookie
| Vendor | InMobi |
|---|---|
| Cookie Domain | inmobi.com |
| Category Category The functional category of the technology, such as Web Analytics or Social Media. Learn more | Advertising & Paid Media |
| Consent Category Consent Category The consent category this cookie most commonly falls under across sites we scan, normalized into four standard categories. Learn more | Targeting & Advertising |
| Prevalence | Very Common |
| Popularity Popularity Popularity is calculated from our dataset of 4.5B+ cookies analyzed across hundreds of millions of web pages. Learn more | Found on 9.9% of scanned pages |
| Expiration Type | Timestamp |
| Expiration Duration | 30 days |
| Party Type Party Type Whether the cookie is first-party or third-party. Learn more | 3rd-Party |
| Risk Level Risk Level Rates how sensitive the data stored by this cookie is (High, Medium, or Low) based on data classification and distribution. Learn more | High |
| Vendor Privacy Policy | https://advertising.inmobi.com/privacy-policy |
| Vendor Website | https://www.inmobi.com/ |
What is the purpose of the iid cookie?
The iid (InMobi ID) cookie is a third-party tracking cookie utilized by the InMobi advertising network. It acts as a unique online identifier to track users across different websites and sessions. The cookie is predominantly set via sync.inmobi.com, which InMobi documents as its cookie-sync endpoint, to facilitate identity resolution and cookie syncing with other advertising technology vendors, such as ID5 (observed in the stored ID5-7-... values) and programmatic demand-side platforms (DSPs). This syncing process allows InMobi and its partners to correlate user identities, enabling audience segmentation, targeted advertisement delivery, and campaign performance measurement.
What are the Privacy Risks of the iid cookie?
Risk Level: High
The iid cookie serves as a persistent cross-site tracking identifier utilized in real-time bidding and programmatic ad ecosystems. Because it syncs identities with third-party data providers and ad exchanges, it facilitates extensive behavioral profiling of users across multiple independent websites without their direct relationship with InMobi, posing a significant privacy risk.
How to Remove the iid cookie from a Website
Since the iid cookie is set by InMobi's programmatic advertising tags or integrated through third-party ad exchanges, website administrators can remove it by identifying and disabling the specific ad-tech vendor tags (such as InMobi DSP, SSP, or ID5 identity sync pixels) dropping this cookie from the site's tag management system. Alternatively, site owners can adjust their header bidding or ad server configurations to exclude InMobi from their demand partners. If InMobi is a required demand or supply partner, the cookie cannot be removed without removing the InMobi integration and its associated cookie-sync pixels entirely.
This definition was last reviewed on August 19, 2026. ObservePoint regularly reviews these definitions to ensure our customers have the most up to date information about the cookies on their websites.