masscan

Scan single port

$ sudo masscan [192.168.1.0/24] -p [80]

$ sudo masscan [192.168.1.0/24] -p [1-65535]

$ sudo masscan [192.168.1.0/24] --ports [0-1023]

$ sudo masscan [192.168.1.0/24] -p [80] --rate [10000]

$ sudo masscan [192.168.1.0/24] -p [80] -oL [results.txt]

$ sudo masscan [10.0.0.0/8] -p [80] --excludefile [exclude.txt]

masscan [options] targets

masscan is the fastest Internet port scanner, capable of scanning the entire Internet in under 6 minutes. It uses asynchronous transmission, sending packets without waiting for responses.
The tool is designed for large-scale network reconnaissance during authorized security assessments. It produces output similar to nmap for compatibility.

-p ports

Ports to scan.

Packets per second.

Grab banners.

List output.

JSON output.

Grepable output.

XML output.

Exclude addresses.

Network interface.

Configuration file.

Wait after sending.

Requires root/raw sockets. High rates may overwhelm networks. Only for authorized testing. May trigger IDS alerts. Stateless scanning may miss filtered ports.

masscan was created by Robert David Graham and released in 2013. It was designed to demonstrate that Internet-wide scanning was feasible and to provide a tool for legitimate security research at scale.

nmap(1), zmap(1), rustscan(1), unicornscan(1)