Under 10 per cent of IPv4 addresses are left

[Mats]

or just changing the ip to 3 digit hex that would add alot of space, 281200199450625

Yeah, and it would be more computer friendly, but those who doesn't have a hex number pad would still find it a bit more pita to use.
My idea was simply to get as much as possible out of a regular num pad.

Besides, I dunno how easy it is to use A - F in those countries who uses some other alphabet than the latin one.
Edit: Well that's an issue with IPv6 as well...