Re: IPv4 Games

[Dan Mahoney via NANOG <nanog () lists nanog org>]

> On Aug 15, 2025, at 23:11, Justine Tunney via NANOG <nanog () lists nanog org> wrote:
>
> I operate an online service at https://ipv4.games/ that invites people to
> send http requests to my web server from a lot of different IP addresses.
> In order to claim an IP, you need to successfully make a tcp three-way
> handshake with a VM on Google's network.
>
> Somehow a player in Europe named femboy.cat has successfully managed to
> claim 20 million IPs, which is 9% of all IPv4 hosts according to Censys.
>
> Does anyone have any idea how they're doing it?

Strongly suggest you run a TCPDump on that VM

-Dan
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