I\'m looking for a solution to find out about the MAC number of a user using asp.net website. I know you can get an IP address (don\'t know why but it can\'t be complicated)
Java 6 has a NetworkInterface#getHardwareAddress() method which usually returns the MAC address of the computer in question. You could create a small Java applet to communicate with your web server to obtain the MAC address, though there are ways and means of spoofing a MAC address.