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Minecraft-Server-Scanner
Let's you scan the entire internet in a couple of hours and identify all Minecraft servers on IPV4
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masscan
TCP port scanner, spews SYN packets asynchronously, scanning entire Internet in under 5 minutes.
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It's most likely a minecraft server detection script. I looked it up and found this, which seems to be what they used, as the name of the script and the username of the account trying to join are both "masscan". Also, they are hosted on a VPS provider called Contabo (you can look up the IP and see for yourself) in St. Louis.
Masscan is a tool for scanning large segments of the internet for open ports. I've used it previously and it's not an inherently malicious tool.
Now my server is on his list of Minecraft servers, which he updates every day. It's at https://github.com/mat-1/minecraft-scans/blob/main/ips.