Re: IPv4 Games

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