If you were not aware to www.shodan.io its just the time to dig and learn the advantages one can get from this search eangin. SHODAN aim to be google like search engine for open services in the great IP range around the globe. In order to do the same it crawls, index and expose the results in simply query dashboard.
In our case the ICS world gets special attention in the industrial-control-systems category page
In that page they share queries to the different SCADA protocols available in the database
You can also verify if your private/customer external IP is listed in the database simply by using the syntax:
https://www.shodan.io/host/184.108.40.206 and updating the IP to the relevant one...