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TCP reachability check across common service ports.

Live queryRate limited

Allowed: 21,22,23,25,53,80,110,143,443,445,587,993,995,3306,3389,5432,6379,8080,8443,27017

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Scope and etiquette

This is a TCP connect check against an allowlist of 20 well-known service ports. There is no banner grabbing, no SYN scanning and no arbitrary port ranges, and private address space is refused. Scan only infrastructure you own or are authorised to test.