This is the fastest Internet port scanner. It can scan the
entire Internet in under 6 minutes, transmitting 10 million
packets per second.
It produces results similar to nmap, the most famous port
scanner. Internally, it operates more like scanrand,
unicornscan, and ZMap, using asynchronous transmission.
The major difference is that it's faster than these other
scanners. In addition, it's more flexible, allowing
arbitrary address ranges and port ranges.