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Asked: 2026-05-19T21:54:59+00:00

Since we are all moving towards IPv6 whether we want it or not, I

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Since we are all moving towards IPv6 whether we want it or not, I ask this: what happened to IPv5? Was it not cool enough for it’s older brother, or did something else happen to that specification?

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  1. Editorial Team

    I believe the answer lies in the “What ever happened to IPv5?” blog post over on http://www.oreillynet.com

    To quote:

    In the late
    1970’s, a protocol named ST — The
    Internet Stream Protocol — was created
    for the experimental transmission of
    voice, video, and distributed
    simulation. Two decades later, this
    protocol was revised to become ST2 and
    started to get implemented into
    commercial projects by groups like
    IBM, NeXT, Apple, and Sun. Wow did it
    differ a lot. ST and ST+ offered
    connections, instead of its
    connection-less IPv4 counterpart. It
    also guaranteed QoS. ST and ST+, were
    already given that magical “5″.

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