Originally Posted by vidsta

if you know the mac adress of your network interface card you can find the ip address. google for that. if you know aproximately where the macbook could be you can find it by tracing the it with an oscilloscope. This way you can find the mac adress if you´re in the range of the respective wifi signal.

BUT:

1. i guess you don´t know how an oscilloscope works.

2. an oscilloscope costs at least about 3000$ (much more than your macbook), and most likely you don´t already have one.

3. even if point 1 and 2 do not apply, your chances of being successfull this way are very very low. so just as it´s been said, if it doesn´t have a gps function implemented you can consider it lost.