<!--
{
  "availability" : [
    "macOS: -"
  ],
  "documentType" : "symbol",
  "framework" : "AddressBook",
  "identifier" : "/documentation/AddressBook/kABUIDProperty",
  "metadataVersion" : "0.1.0",
  "role" : "Global Variable",
  "symbol" : {
    "kind" : "Global Variable",
    "modules" : [
      "Address Book"
    ],
    "preciseIdentifier" : "c:@kABUIDProperty"
  },
  "title" : "kABUIDProperty"
}
-->

# kABUIDProperty

The unique ID for this record. It’s guaranteed never to change, no matter how much the record changes. If you need to store a reference to a record, use this value. Type: [`kABStringProperty`](/documentation/AddressBook/kABStringProperty).

```
let kABUIDProperty: String
```

---

Copyright &copy; 2026 Apple Inc. All rights reserved. | [Terms of Use](https://www.apple.com/legal/internet-services/terms/site.html) | [Privacy Policy](https://www.apple.com/privacy/privacy-policy)