What happened to IPv1, IPv2, IPv3, and IPv5?

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IPv1
IPv2
IPv3
IPv4
IPv5
IPv6
WAN
I hear a lot about IPv4 and IPv6, but what happened to IPv1, IPv2, IPv3, and IPv5?

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IPv1, 2, & 3 would be part of the TCP/IP protocols, of which there were 3 versions before the IP protocol was split of of it. IPv4 is actualy the first version of the IP protocol. IPv5 is an experimental TCP/IP protocol called the Internet Stream Protocol that never really went anywhere because increases in badwith made streaming over IPv4 feasible. So IPv5 was never finalized and they skiped to IPv6. 

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  • Guardian
    Yes i think it was to do with the procedures and standards most they could have had issues but not sure. Good question though....
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  • Teicneoir
    IPv1, 2, & 3 would actually be part of the TCP/IP protocols, of which there were 3 versions. IPv4 is were they split the 2 in to separate protocols and created an updated IP protocol. IPv5 is an experimental TCP/IP protocol called the Internet Stream Protocol that never really went anywhere. So they skipped 5 and went to IPv6. If you want to know more - http://www.tcpipguide.com/toc.htm
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  • The Most-Watched IT Questions: December 28, 2010 - ITKE Community Blog
    [...] Wondering what happened to IPv1, IPv2, IPv3, and IPv5? Search Enterprise informs us why IPv4 and IPv6 have taken the stage in front of the [...]
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  • KingGamer2357
    IPv1, IPv2, and IPv3 were eventually scraped because the needed more possible IP addresses so they made the IPv4 which can have 4.2.... billion possible addresses, While IPv5 I don't know what happened

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  • JustinWilson07
    V1, V2 and V3 were just the test versions that were improved as the internet started to grow. I believe V5 and V6 were started at the same time but they realized that V5 would take a long time for acceptance for a new version of IP, so that is why V6.
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