No software comes to mind, but it should be pretty easy to write a script compare the two lists. I used do something similar all the time using QBasic many moons ago. Joe _____ From: thin-bounce@xxxxxxxxxxxxx [mailto:thin-bounce@xxxxxxxxxxxxx] On Behalf Of Scott R Sent: Monday, December 15, 2003 9:22 PM To: thin@xxxxxxxxxxxxx Subject: [THIN] OT: National do not call list Can anyone here recommend software that will compare phone numbers to the national do not call registry? Thanks, Scott