It is a way of encoding an IP address.
Rather than using the standard xxx.xxx.xxx.xxx you can encode it by performing simple maths on the numbers (which of course I have forgotten :( ) and generating a single number.
It's basically the same principal that makes 1011 in binary the same as 11 in Decimal
>I get a junk mail, and find a web site url like:
>it work under my Netscape. Anybody know what is the magic code?