What channel is MTV on Comcast?

I recently bought a HDTV tv and instead of using the converter box from Comcast, I plugged the cable directly into my tv. I've found most of channels I was looking for, but I cant seem to find MTV! It isn't channel 43 like it is through the box. And I've tried the channels I've found in forums yet none seem to work. I live in Oakland, CA and have Comcast. Anyone know the channel?! Thank you!