How do I know if my printer has the AirPrint capabilities?

I have an iPad 4th generation and I still haven't installed the latest software for it. Before doing the software update, I need to know if my printer is AirPrint capable. My printer is an Epson Stylus NX430. I was playing around with my boss iPad that has the latest software update and when I tried printing from it, it would say no airprint found. That printer was also an Epson but different model and then we switch the priner to a Samsung and still says no airprint found. I didn't think this was going to be difficult. Help please.