The ZMap project

The ZMap project https://zmap.io/
The ZMap Project is a collection of open source tools that enable researchers to perform large-scale studies of the hosts and services that compose the public Internet.
ZMap is a fast single packet network scanner designed for Internet-wide network surveys. On a computer with a gigabit connection, ZMap can scan the entire public IPv4 address space in under 45 minutes. With a 10gigE connection and PF_RING, ZMap can scan the IPv4 address space in 5 minutes.
Zakir Durumeric, Eric Wustrow, and J. Alex Halderman

The project led to the public data repository at scans.io (site) and a service at censys.io (site)

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