“ Be conservative in what you do, be liberal in what you accept from others ”
I also administer the Internet Assigned Names Authority, which is the central coordinator for the Internet address space, domain names and Internet protocol conventions essential to the use and operation of the Internet.
~ Jon Postel
One of the things that is not so good is that a decision was made long ago about the size of an IP address - 32 bits. At the time it was a number much larger than anyone could imagine ever having that many computers but it turned out to be to small.