Even if it's dynamic, the first several should be the same when he logs on from the same loc'n. He'll get his dynamic IP from the same static pool every single time. If he's a dozen states distant, he'll most likely be logging in to a different server, who'll have a different set of dynamic IPs to hand out.
LynnsABCs -- I thought you had left! It's good to see that you didn't follow through on your promise to leave us all forever.
Thanks for coming back!
Dan