Masscan

Windows · Mac · Linux · Self-hosted

Freedom report

Three barsScore 6.5

Free tierA free tier is on its own pricing page
Open codeNo open-source code on record
Runs widely3 of 6 device platforms
DocumentedPlans, terms and facts published

Masscan is ranked #5 of 25 in port scanner software on Freedom251. It runs on Linux, macOS, Self-hosted, Windows. There is a free plan.

Masscan plans and pricing

All plans

Masscan Free Free software under the GNU Affero General Public License v3 github.com · 5 Oct 2026

Compared on port scanner software

Free plan: Yes
Deployment: cli
Scan scope: internet
Service detection: Yes
Export formats: XML, binary, grepable, JSON, list

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The record

Purpose: Masscan is an Internet-scale TCP port scanner designed for wide-range scanning of many machines.
Speed: The project says Masscan can transmit 10 million packets per second from a single machine.
Scanning: It supports arbitrary port and address ranges and asynchronous transmission.
Banner checks: Banner checking is supported for FTP, HTTP, IMAP4, memcached, POP3, SMTP, SSH, SSL, SMBv1, SMBv2, Telnet, RDP, and VNC.
IPv6: IPv4 and IPv6 can be scanned together, without a separate IPv6 mode.
Output: Supported output formats are XML, binary, grepable, JSON, and list.
Compatibility: Masscan's usage and output are designed to be familiar to Nmap users, with some Nmap-compatible options.
Integrations: The project describes PF_RING DNA support for high-speed packet transmission and says Masscan can use PF_RING ZC when the adapter name indicates it.
Platforms: Linux is the primary target; the code also runs on Windows and macOS, and the README gives build instructions for FreeBSD.
Security: The project says it offers a vulnerability bounty and uses functions such as safe_strcpy() in place of strcpy().
License: Masscan is free software under the GNU Affero General Public License version 3, with no warranty stated in the license notice.
Notable limitation: Masscan requires users to specify ports and accepts IP addresses or simple ranges rather than DNS names as targets.
Operational consideration: The README warns that Masscan's custom TCP/IP stack can conflict with the local stack and describes using a separate source IP or firewalling its source port.
Intended users: The README describes Masscan as tuned for scanning many machines across wide ranges, while Nmap is described as designed for intensive scanning of a single machine or small range.
Price from: Free

Where it ranks on Freedom251

Best Port Scanner Software in 2026#5 of 25

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Sources

github.com/robertdavidgraham/masscan· checked 5 Oct 2026