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  • How do I find out who owned an original Class A network before it was s

    From David@21:1/5 to All on Sat Sep 14 18:59:42 2024
    I am half way down (up?) a rabbit hole due to chasing ownership of IPV4 addresses.

    I can take a known address and use WHOIS to find out the current owner,
    and the range that it is part of.

    However back in the day the Class A networks were handed out like sweeties
    to early adopters, but have mainly been clawed back now.

    I have found a very useful Wikipedia page which lists a lot of original
    owners, but this doesn't fully tie in with what I think I know.

    I always thought that BT (formerly Post Office) owned at least 2 Class A networks at one time.

    So is there an interactive tool which shows who owns the Class A (and is presumably responsible for the allocation of subnets)?

    I realise that a lot of the businesses which originally owned these Class
    A networks (e.g. DEC) no longer exist as such.

    Cheers



    Dave R

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  • From Abandoned Trolley@21:1/5 to All on Sun Sep 15 10:25:37 2024
    "and is presumably responsible for the allocation of subnets" ?


    That would imply that CIDR was effectively administered by the original
    network / subnet owners - which I would think a bit unlikely

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  • From Theo@21:1/5 to David on Sun Sep 15 14:19:35 2024
    David <[email protected]> wrote:
    I am half way down (up?) a rabbit hole due to chasing ownership of IPV4 addresses.

    I can take a known address and use WHOIS to find out the current owner,
    and the range that it is part of.

    You can also look things up in the BGP (ie the current routing database), eg: https://bgp.he.net/

    However back in the day the Class A networks were handed out like sweeties
    to early adopters, but have mainly been clawed back now.

    I have found a very useful Wikipedia page which lists a lot of original owners, but this doesn't fully tie in with what I think I know.

    This one?
    https://en.wikipedia.org/wiki/List_of_assigned_/8_IPv4_address_blocks

    I always thought that BT (formerly Post Office) owned at least 2 Class A networks at one time.

    So is there an interactive tool which shows who owns the Class A (and is presumably responsible for the allocation of subnets)?

    https://ant.isi.edu/address/browse/index.html
    is current.

    Not interactive, but as of 2006:
    https://xkcd.com/195/
    and https://ant.isi.edu/address/
    has a screenshot from 2010, and a video 2006-14.

    They have a dataset repository going back to 2006 but it looks like you have
    to request access.

    Theo

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