Zoom in on the map to your town and then click on the nearest pin to you. On the left you will then see the town name and the Cable Net ID(s) in the description, some towns have more than one Net ID so you may have to try each before you find one that works for you. In some cases the nearest town is not alway the one that works for you so if the Cable Net ID for the nearest town doesn't work, try another local town.