Masscan vs Nmap
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About Masscan
Masscan is the fastest Internet port scanner. It can scan the entire Internet in under 6 minutes, transmitting 10 million packets per second from a single machine. It produces results similar to Nmap but operates asynchronously, transmitting packets without waiting for responses. The internal architecture is more similar to scanrand and unicornscan than traditional scanners. It uses a custom TCP/IP stack to avoid the overhead of the operating system's networking stack.
About Nmap
Nmap (Network Mapper) is a free and open-source utility for network discovery and security auditing. It uses raw IP packets to determine available hosts, services, operating systems, packet filters/firewalls, and dozens of other characteristics. It was designed to rapidly scan large networks but works fine against single hosts. Nmap's scripting engine (NSE) allows users to write and share scripts to automate networking tasks, from vulnerability detection to backdoor discovery. It's used by security professionals, system administrators, and researchers worldwide.
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Masscan only
Nmap only