Private IP ranges: Class From To Class A or 24 Bit 10.0.0.0 10.255.255.255 Class B or 20 Bit 172.16.0.0 172.31.255.255 Class C or 16 Bit 192.168.0.0 192.168.255.255 HTH Sean G. > -----Original Message----- i couldn't think of any ip addresses the were open in the 10.0.0.x range so instead i pulled a number out of my butt which happened to be 10.0.1.0. to my suprise this worked out fine. so now i have a different question. can i use any number from 0 to 255 in place of the x in 10.x.x.x ? for example... would 10.0->255.0->255.0->255 work just fine (except for 10.0.0.0 right?)? when would i need to change the subnet mask, if ever? thanks, chris. -- For unsubscribe and other options, including the Tip Harvester and archive of thelist go to: http://lists.evolt.org Workers of the Web, evolt !