Some idiot is using your tool to mass scan our network
As a security professional I'm very disappointed when I read the (often angry) messages people  have written to the maintainer/author of this software. You can read them here, in the ip range blacklist: https://github.com/robertdavidgraham/masscan/blob/master/dat...If you don't want people on the internet to connect to your server, then you shouldn't allow network connections to your server. A few connections per minute hardly classify as abuse in any reasonable sense of the word.The owner of the source network, on the other hand, (compared to the destination server), I think have a more legitimate reason to raise flags. Most cloud providers for example do not allow port scanning from their network (for various reasons). If you're gonna send out millions of packages all over the place I think it's good practice to inform your network provider first.