Hello Everyone,
I worked through this with a colleague of mine and he figured this out. I didn't go far enough in my subnetting before I answered the question but this is correct.
so with a .240 subnet mask there are 16 subnets-- .0 through .15, .16 through .31, .32 through .47, .48 through .63 etc.
the first address in each of those ranges is the network ID
so .50 falls within the .48 network
It's been a while since I subnetted so I am out of shape in that department.
Thanks a lot everyone for working together on this