I have been reading at quite a few places about TCPIP v3 being out ...

I wanted to know what is this TCPIPv3 and what are differences between 2 and 3. I tried to google out the answer but could not get anything solid.

Thanks for your time.


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  • Does TCP/IP have version numbers? It's a set of protocols. TCP probably does (though I know nothing about them), and IP has v4 and v6, but a version number for the group makes no sense to me at all. – Samir Talwar Sep 10 '09 at 18:31
  • This doesn't seem to be programming related. – ssg Sep 10 '09 at 18:36
  • 2
    Where did you see this, specifically ? It sounds more like the version of a particular TCP/IP stack, or the reveision of a TCP/IP book. – nos Sep 10 '09 at 19:11

Do you maybe mean:

Because I doubt you are talking about IPv3. According to Wikipedia:

Version numbers 0 through 3 were development versions of IPv4 used between 1977 and 1979.

  • TCP/IP Illustrated Volume 3, maybe? – Gerald Combs Sep 10 '09 at 20:37
  • RFC 793 defines the TCP; there does not seem to be a TCP version number separate from the IP version number (of which, as others state, IPv4 and IPv6 are the only ones you're likely to encounter). – Jonathan Leffler Sep 11 '09 at 5:09

Could it refer to a specific vendor's TCP/IP stack version?


I'd second Gerald Combs' answer -- This is most likely Richard Stevens' TCP/IP Illustrated, Volume 3

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