LOL, reminds me of the time we set our MAC addresses to a series owned by a car company or some other normally non IT company when I was working for the local government. Needless to say, the firewall did not like it one bit. For those interested, http://coffer.com/mac_find/ has a search utility to find vendors of specific products. At 11:44 PM 10/2/2002 -0500, you wrote: >Mark Anderson wrote: > > I'm trying to obtain programmatically the MAC Addresses/Physical > Address for > > ADSL modems! >/ > > I have a client that wants to be able to uniquely identify a whole > series of > > pc's they have which are spread around the country and connected to the > > internet and check a unique unalterable id against a central database so > > they can load appropriate updates etc. Basically it's to be part of a > > licensing system! > >Uh, well. Possibly, MAC addresses aren't *quite* what you want. :-) >They *are* guaranteed unique from chip to chip, but unalterable? No.