https://jeffmcjunkin.com/Personal site of Jeff McJunkin — penetration testing, red teaming, and security training. 2026-07-29T10:47:10-07:00 Jeff McJunkin https://jeffmcjunkin.com/ Jekyll © 2026 Jeff McJunkin /assets/img/favicons/favicon.ico /assets/img/favicons/favicon-96x96.png 2018-11-05T15:39:00-08:00 2026-07-29T10:46:48-07:00 https://jeffmcjunkin.com/posts/masscan/ Jeff McJunkin

Often when doing penetration tests, clients will ask me to scan their external network presence1. For smaller companies, I can often use nmap from start to finish for all my scanning needs. However, for the sake of larger network ranges let’s separate out some of our scanning needs: Network sweeping: Determining which IPv4 addresses have any listening services (finding “live” hosts) Port ...