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""JohnZ"" wrote in message [EMAIL PROTECTED]">news:[EMAIL PROTECTED]... > Can someone correct if I am wrong here > 191.72.1.0 x.x.00000001.0 > 191.72.2.0 x.x.00000010.0 > 191.72.4.0 x.x.00000100.0 > 191.72.12.0 x.x.00001100.0 > 191.72.21.0 x.x.00010101.0 > > > Am I correct in supernetting this to 191.72.0.0 /19 255.255.11100000.0 first three leftmost bits in the third octet are the only ones common to all the subnets you mention yes, you have supernetted the subnets in question, plus a few more you didn't mention Message Posted at: http://www.groupstudy.com/form/read.php?f=7&i=54406&t=54403 -------------------------------------------------- FAQ, list archives, and subscription info: http://www.groupstudy.com/list/cisco.html Report misconduct and Nondisclosure violations to [EMAIL PROTECTED]