--- title: What are Global, Custom, and Family IDs? description: "Ripple uses three types of IDs to manage participants in studies: Global ID: Custom ID: Family ID: These ID types ensure streamlined participant organization and tracking across studies and profiles." --- [Skip to content](https://support.enrollnow.io/en/knowledge-base/what-are-global-custom-and-family-ids#main-content) [EnrollNow Support Center](https://support.enrollnow.io/helpdesk?hsLang=en) ![Logo + Tagline](https://support.enrollnow.io/hs-fs/hubfs/EnrollNow/Brand%20Assets/Logo%20+%20Tagline.png?width=300&height=75&name=Logo%20+%20Tagline.png) - [Support Center](https://support.enrollnow.io/helpdesk) - [User Community](https://academy.enrollnow.io/) - [Learning Academy](https://academy.enrollnow.io/) - [Knowledge Base](https://support.enrollnow.io/en/knowledge-base) Open main navigation Close main navigation - [Support Center](https://support.enrollnow.io/helpdesk) - [User Community](https://academy.enrollnow.io/) - [Learning Academy](https://academy.enrollnow.io/) - [Knowledge Base](https://support.enrollnow.io/en/knowledge-base) - [EnrollNow Support Center](https://support.enrollnow.io/helpdesk) How can we help you? - There are no suggestions because the search field is empty. 1. 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[Participants](https://support.enrollnow.io/en/knowledge-base/participants?hsLang=en) May 1, 2026 # What are Global, Custom, and Family IDs? ### EnrollNow ID types EnrollNow uses **three types of IDs** to manage participants in studies: 1. **Global ID**: - A unique hash/ID assigned globally to each participant across all studies. - Appears in the registry and on participant profile pages in every study. - **Locked and unchangeable** after assignment, except through the import tool, which allows updates by matching participants via **First Name**, **Last Name**, and **Birthdate**, and providing a new Global ID. 2. **Custom ID**: - A **study-specific alphanumeric ID** to identify participants within a single study. - Examples: numbering participants sequentially (e.g., 1, 2, 3) or grouping them (e.g., 1001, 2002). - The same Custom ID can be reused in different studies but cannot be duplicated within the same study (EnrollNow will warn you). 3. **Family ID**: - A **Family ID** used to **link participants** as a family across all studies. - Participants with the same Family ID are connected in their profiles under a "Family" section. - Displays shared family details such as names, studies, genders, and current ages. - The same family ID can not be reused in different studies within your EnrollNow site. 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