--- title: "Segmentation: identifiers" slug: "segmentation-identifiers" updated: 2026-06-08T22:40:17Z published: 2026-06-08T22:40:17Z canonical: "docs.xtremepush.com/segmentation-identifiers" --- > ## Documentation Index > Fetch the complete documentation index at: https://docs.xtremepush.com/llms.txt > Use this file to discover all available pages before exploring further. # Segmentation: identifiers Segment users based on their identifiers (user ID, email, etc) To create segments based on their identifiers, select **Identifiers** from the data categories dropdown list. Once you have added the relevant criteria outlined below, click **Save**. > [!TIP] > Targeting a large number of users? > > For all the available identifiers, the segmentation engine allows targeting several devices or profiles by using the condition *one of* and providing a list of identifiers (for example, a list of 5 user IDs). If you want to target a long list of recipients, it is recommended to use a [user list](/documentation/docs/create-a-user-list) instead of the *one of* condition, for best results. The types of identifiers available are: ## User ID Identify users based on their [user ID](/documentation/docs/set-user-id) (unique external identifier that allows to link profiles and devices). There are several comparison operator choices available (**Equals**, **Not equals**, **One of**, **Not one of**, **Is set** and **Is not set**) and an input field for you to enter a user ID or a list of them, separated by commas. ![2214](https://cdn.document360.io/b056e88b-f6c1-4bd2-b5b8-08e9336a17c9/Images/Documentation/9d3d7ea-Screenshot_2021-03-08_at_14.52.27(1).png) The example above shows a condition that applies to user profiles whose user ID is '12345678'. ## Email Identify users based on their email address. There are several comparison operator choices available (**Equals**, **Not equals**, **One of**, **Not one of**, **Is set**, **Is not set**, **Domain equals** and **Domain not equals**) and an input field for you to enter a domain, an email address, or a list of them, separated by commas. ![2210](https://cdn.document360.io/b056e88b-f6c1-4bd2-b5b8-08e9336a17c9/Images/Documentation/bfbf39b-Screenshot_2021-03-08_at_14.58.17(1).png) The example above shows a condition that applies to users whose email domain is equal to `xtremepush.com`. This is a typical use case to target employees in an organisation. ## Mobile number Identify users based on their mobile number. A drop-down list comes with a selected operator (same operators available as for user ID), and an input field for you to enter a user's mobile number or a list of mobile numbers. ![2156](https://cdn.document360.io/b056e88b-f6c1-4bd2-b5b8-08e9336a17c9/Images/Documentation/7c5d27f-Screenshot_2021-03-09_at_10.35.20(1).png) The example above shows a condition that applies to users whose mobile number is '447400123456' or '353850123456'. Review this [guide](/documentation/docs/user-profile-create) to know what is the correct format for SMS sends. ## WhatsApp number Identify users based on their WhatsApp number A drop-down list comes with a selected operator (same operators available as for user ID), and an input field for you to enter a user's Whatsapp number or a list of Whatsapp numbers separated by commas. ![2204](https://cdn.document360.io/b056e88b-f6c1-4bd2-b5b8-08e9336a17c9/Images/Documentation/df31263-Screenshot_2021-03-08_at_15.38.32(1).png) The example above shows a condition that applies to users whose Whatsapp number is not '440123456789'. ## Device ID Identify users based on their device ID. Device IDs identify [device profiles](/documentation/docs/device-profile). A drop-down list comes with a selected operator (available operators are **Equals**, **Not equals**, **One of**, **Not one of**), and an input field for you to enter an Xtremepush device ID or a list of device IDs separated by commas. ![2152](https://cdn.document360.io/b056e88b-f6c1-4bd2-b5b8-08e9336a17c9/Images/Documentation/33cd153-Screenshot_2021-03-09_at_11.00.59(1).png) The example above shows a condition that applies to users whose device ID is '2019883508'. ## Android ID Identify users based on their Android ID. The Android ID, also known as ANID, is the device identity tag. A drop-down list comes with a selected operator (same operators available as for user ID) and an input field for you to enter an Android ID or a list of Android IDs separated by commas. ![2208](https://cdn.document360.io/b056e88b-f6c1-4bd2-b5b8-08e9336a17c9/Images/Documentation/a6d6809-Screenshot_2021-03-09_at_10.27.44(1).png) The example above shows a condition that applies to users whose Android ID is not 'abcd123a-ab1a-12ab-1234-1234a123a123' ## Android Advertising Identifier Identify users based on their ADID. The [Android Advertising Identifier (ADID)](https://support.google.com/googleplay/android-developer/answer/6048248?hl=en) is an identifier assigned by Google to a user's device and used by advertisers to track data. A drop-down list comes with a selected operator (same operators available as for user ID) and an input field for you to enter an ADID or a list of ADIDs separated by commas. ![The example above shows a condition that applies to users whose Android Advertising Identifier is ‘abcd123a-ab1a-12ab-1234-1234a123a123’.](https://cdn.document360.io/b056e88b-f6c1-4bd2-b5b8-08e9336a17c9/Images/Documentation/dd126bd3c3efe9f74eedcaabbe0c501e5535ded58e121643a3445b2daf4128b7-image(1).png) The example above shows a condition that applies to users whose Android Advertising Identifier is ‘abcd123a-ab1a-12ab-1234-1234a123a123’. ## IDFV Identify users based on their IDFV. As explained on Apple's website, The Identifier for Vendor (IDFV) identifies a device to the app's vendor. More info can be found [here.](https://developer.apple.com/documentation/uikit/uidevice/1620059-identifierforvendor) A drop-down list comes with a selected operator (same operators available as for user ID) and an input field for you to enter an IDFV or a list of IDFV separated by commas. ![2202](https://cdn.document360.io/b056e88b-f6c1-4bd2-b5b8-08e9336a17c9/Images/Documentation/c73b31e-Screenshot_2021-03-09_at_10.29.19(1).png) The example above shows a condition that applies to users whose IDFV is not 'AB12345A-AB12-12AB-1AB2-12AB1AB12A12'. ## IDFA Identify users based on their IDFA. The Identifier for Advertisers (IDFA) is an identifier assigned by Apple to a user's device and used by advertisers to track data. A drop-down list comes with a selected operator (same operators available as for user ID) and an input field for you to enter an IDFA or a list of IDFAs separated by commas. ![2206](https://cdn.document360.io/b056e88b-f6c1-4bd2-b5b8-08e9336a17c9/Images/Documentation/5b8ea96-Screenshot_2021-03-09_at_10.31.01(1).png) The example above shows a condition that applies to users whose IDFA is 'AB12345A-AB12-12AB-1AB2-12AB1AB12A12'.