zmap - 2.1.1-2+b6 main

ZMap is a 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.
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ZMap can be used to study protocol adoption over time, monitor
service availability, and help people better understand large systems
distributed across the Internet.