Scanning Tools - Gexos/Hacking-Tools-Repository GitHub Wiki
ZMap
"ZMap is an open-source network scanner that enables researchers to easily perform Internet-wide network studies. With a single machine and a well provisioned network uplink, ZMap is capable of performing a complete scan of the IPv4 address space in under 45 minutes, approaching the theoretical limit of gigabit Ethernet."
URL: https://zmap.io/