On 03/01/11 11:51 AM, Always Learning wrote: > >> 4 hex digits vs. 1-3 decimal digits provides adequate disambiguation. > 1:2:3:4 or 1.2.3.4 ? Each segment of the former is a valid 'decimal' > number and also a valid 'hexadecimal' number. Each segment of the later > is a valid decimal number. except thats not a valid ipv6 address, it has too few components. 1:2::3:4 would be (implying 1:2:0:0:0:0:3:4). if you used '.' as your seperator, 1.2..3.4 would be too, and its distinguishable from ipv4 due to the ..