On 12-Oct-2006 17:52.11 (BST), Dave Ihnat wrote: > Anyway, the addresses you gave, converted to binary, are: > > 219.128.0.0 : 11011011.10000000.00000000.00000000 > 219.137.255.255: 11011011.10001001.11111111.11111111 > ^ > The last bit that is invariant between the two is marked with the caret; > converting back to a decimal dotted-quad (you can use 'dc' again--to set > the input to binary, simply change the 'o' operand in the above example > to an 'i', then input the binary value and print.) > > Mask > 255.240.0.0 : 11111111.11110000.00000000.00000000 > > or, in conventional notation, 219.128.0.0/12. That's 219.138.0.0 - 219.143.255.255 though :) -- rob andrews :: pgp 0x01e00563 :: rob@xxxxxxxxxxxxx
