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# CLBeaconIdentityConstraint

Identity characteristics that can match one or more beacons.

```
class CLBeaconIdentityConstraint
```

## Overview

A constraint specifies beacon identity characteristics. Use constraints to check for matching beacons by comparing the beacon’s identity characteristics ([`uuid`](/documentation/CoreLocation/CLBeacon/uuid), [`major`](/documentation/CoreLocation/CLBeacon/major), and [`minor`](/documentation/CoreLocation/CLBeacon/minor)) to those in the constraint.

Constraints always specify a UUID value, but the major and minor values are optional. A beacon satisfies the constraint if all three identity characteristics of the beacon match the same characteristic of the constraint. Major and minor characteristics are wildcards if they have no value. A major or minor wildcard value matches any value in the beacon’s corresponding characteristic.

## Topics

### Getting the beacon identity

[`major`](/documentation/CoreLocation/CLBeaconIdentityConstraint/major)

The constraint’s value for the major identity characteristic.

[`minor`](/documentation/CoreLocation/CLBeaconIdentityConstraint/minor)

The constraint’s value for the minor identity characteristic.


---

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