I don't have an ipod touch, but I do know computers and MAC addresses and such (designed a few Ethernet controllers...). Anyway, found this on the web:

Click Settings/General/About

It's shown as the Wi-Fi Address

The MAC address should look something like: 01:FE:AC:4C:5F:11.

I made the address up, but it's six sets of two digit hex(idecimnal) numbers. Sometimes called a physical address. This is not to be confused with an IP address which looks like: 192.168.15.1, which is four sets of decimal numbers with the range of 0-255 each. And don't ask why one's hex and the other is 8 bit binary represented as a decimal number and one has dot's and the other colons. It is the way is it. And it's about as old as FF programs...

Billy