Probably not a great idea to make it so easy to scan the entire internet. Even providing the command in the readme before explaining why it is a bad idea.

There are numerous public domain tools that do this, so the cat is already out of the bag.

Last I read about it, you can scan the entire IPv4 space for a port in about 40 minutes providing you have the bandwidth and a forgiving ISP. I see another comment claiming a tool can do it in 6 minutes. Easy at "apt get install" and a single command.

Qub3d

The tool that can do it in 6 minutes is massscan, the original repo of which is the link of the post:

https://github.com/robertdavidgraham/masscan

Note that "scan the internet in 6 minutes" only means this tool is capable of generating packets fast enough on the host machine to theoretically do a 6 minute scan. In practice, the NIC, home network, and local ISP connection will bottleneck and the scan will be orders of magnitude slower.