I chat about my issues with our vuln scanner and destroy the discovery scan times from 5-8 days to 1hr with Masscan.
bug ? / workaround
my current cmdline
masscan -p21,22,23,25,53,80,88,110,111,113,135,139,143,220,264,389,443,445,449,524,585,636,993,995,1433,1521,1723,3306,3389,5900,8080 --rate=14114 --open --excludefile BLACKLIST --ping 172.16.0.0/12 -oX 172.xml