Yes they do, but only small pieces of data, normally a unique identifier. Allowing mobile apps to differentiate between beacons.

iBeacon broadcast one type of data and a unique ID number (UUID, Major and Minor numbers).

Eddystone broadcast three different types of data: a unique ID number (Eddystone-UID), a URL address (Eddystone-URL), and Telemetry packet (Eddystone-TLM).

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