That's what masscan automates. To fully utilize ms, one requires a friendly ISP. And even then, they can only be ms-friendly as long as their peers are. If you

That's what masscan automates. To fully utilize ms, one requires a friendly ISP. And even then, they can only be ms-friendly as long as their peers are. If you annoy the peers enough, they'll just drop you (http://www.sudosecure.com/ecatels-harboring-of-spambots-and-malware-causes-bgp-peers-to-stop-peering-with-them/ http://www.sudosecure.com/ecatels-harboring-of-spambots-and-...). Many datacenters classify port-scanning as an offensive action, even with low package thoughput. Pulling data from research servers (such as Censys), reducing and then scanning is always a good idea.