reply to floydb1982
Because it was designed by geeks, and geeks loathe the number 5. Think about it, Star Trek 5 sucks, Netscape 5 sucked so bad it was scrapped before it was even released, IE 5 was a scourge of the internet.. 5 just plain sucks.
Unless it's Babylon 5.
And so they skipped 5. Because IP is not Babylon.
I like that explanation better, anyway.
Think Outside the Fox.