How to configure an URL for a determined asmx web service

Question

I'm not sure if it's properly asked but here's my situation: I have a WebService which file name is Service1.asmx and this is accesed by the browser with the following URL: http://localhost:4444/Service1.asmx; what I'm trying to achieve is accessing it not by the filename of the service but by some kind of alias:

http://localhost:4444/ws1

Thanks in advance for your time.