Adding DS18b temperature sensors to Pi4 running Home Assistant OS

I want to add several DS18B temperature sensors to my Pi4 running Home Assistant OS. I’ve looked at the MQTT-IO addon but it assumes you know the address of the sensor - which of course I don’t as there is nothing to indicate this on the packaging. AFAIK you need to detect the sensor to get its address.

Any ideas how to do this?

Gareth