The Estimote app ( IOS / Android) is your best option to locate the identifiers for your beacons. It is also helps to determine if a beacon is active, as it will appear in range if it is powered on. Do not login to the app when using it on IOS. The information displayed is different and in order to easily view the identifiers for a beacon you need to be logged out of the Estimote app. If you are using the Android, you must be logged in as the account that 'owns' the beacons, else it will not display the beacon details. If possible, use an IOS device when working with the Estimote app.
Once the app is installed, tap on Devices in the bottom right corner of the app to start scanning for nearby devices. It will display to colour of the beacons to help you identify them. Tap on one beacon to load the beacon information. See the screenshot for an example.