This is slick. It properly managed to tell me every state I just broke a law in. http://carryconcealed.net/packngo/
There is another site under the NRA banner that lists reciprocity. Both are "musts" for traveling. Every time I go see the kids, I could get bagged for something crossing thru NJ and NY. How I hate that part of the ride.
That link calculates reciprocity for you based on what state you hold a permit in. page 2 has a graphical map of the US that you can click on each state you will travel through.