The 1.3.2 version of masscan for Mac is provided as a free download on our software library. This free software for Mac OS X is a product of Robert David Graham. The software relates to Internet & Network Tools. This Mac download was scanned by our antivirus and was rated as virus free. The latest setup file that can be downloaded is 402 KB in size.
From the developer:
Masscan is a TCP port scanner which spews SYN packets asynchronously, scanning entire Internet in under 5 minutes.
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.
You may want to check out more software for Mac, such as AbleFtp7, OTR Proxy or Hotline, which might be related to masscan.