I recognize the other formats, but what format is "http://7393249866/"? It opens about:blank in chrome. How is it distinguished from the format above it?
7393249866 mod 2^32 is 3098282570. I'm not convinced you can do that - although it works in Firefox, telnet and ping don't like it.
Edit: I highly doubt that this is standard behavior. I suspect that implementations that permit this are storing the number in a 32 bit integer and not checking to see that it was truncated.
