masscan: add page (#6986)

pages/common/masscan.md

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+# Masscan
+
+> Network scanner for scanning as fast as possible.
+> Best run with elevated priviledges. Nmap compability run `masscan --nmap` to find out more.
+> More information: <https://github.com/robertdavidgraham/masscan>.
+
+- Scan an IP or network subnet for port 80:
+
+`masscan {{ip_address|network_prefix}} --ports {{80}}`
+
+- Scan a class B subnet for the top 100 ports at 100,000 packets per second:
+
+`masscan {{10.0.0.0/16}} --top-ports {{100}} --rate {{100000}}`
+
+- Scan a class B subnet avoiding ranges from a specific exclude file:
+
+`masscan {{10.0.0.0/16}} ‐‐top-ports {{100}} ‐‐excludefile {{path/to/file}}`
+
+- Scan the Internet for port 443:
+
+`masscan {{0.0.0.0/0}} --ports {{443}} ––rate {{10000000}}`
+
+- Scan the Internet for a specific port range and export to a file:
+
+`masscan {{0.0.0.0/0}} --ports {{0-65535}} -output-format {{binary|grepable|json|list|xml}} --output-filename {{path/to/file}}`