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Copy file name to clipboardExpand all lines: src/guides/working-with-ids.md
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>warning "Critical Segment recommendation"
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>Segment recommends that you use`uuid4` for`anonymousId`.
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>Segment recommends that you use`uuid4` for`anonymousId`,`userId`, and`groupId`.
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As part of your Segment implementation, you’ll come across various identifiers (IDs) that Segment’s systems may process. The three most prominent identifiers you’ll encounter are`anonymousId`,`userId`, and`groupId`.
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##Segment's guidance on identifier formats
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As you work with identifiers,**Segment recommends that you use`uuidv4` for`anonymousId`**. The following table lists the criteria that Segment recommends your identifiers satisfy, as well as why Segment recommends`uuidv4`:
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As you work with identifiers,**Segment recommends that you use`uuidv4` for`anonymousId`,`userId`, and`groupId`**. The following table lists the criteria that Segment recommends your identifiers satisfy, as well as why Segment recommends`uuidv4`: