The
version of Internet
Protocol (IP) used on most computer networks today is four, typically
called IPv4. The next version of IP expected to one day become the new
worldwide standard is version six (IPv6).
Some
people who study computer networking are understandably curious to know what
happened to the protocol version in-between, the hypothetical IPv5.
In short, IPv5
never became an official protocol. Many years ago, Internet Stream Protocol (ST) was
considered IP version five by industry researchers, but ST was abandoned before
ever becoming a standard or widely known as IPv5. Work on ST and IPv5 is not
expected to ever restart.
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