Question 1

How does this hybrid port scanner detect open ports?

Accepted Answer

The tool combines real-world port intelligence from Shodan InternetDB (to uncover non-HTTP ports like SSH 22, DNS 53, and MySQL 3306) with direct in-browser socket timing analysis.

Question 2

Why are some ports marked as 'Restricted' by browsers?

Accepted Answer

The WHATWG browser security standard blocks direct web-page access to dangerous ports like 25 (SMTP) and 21 (FTP) to prevent cross-protocol exploitation.

Question 3

What is the difference between closed and filtered ports?

Accepted Answer

A closed port actively rejects incoming connections (TCP RST), while a filtered port silently drops incoming packets via a firewall, causing a timeout.

Scan open ports on a host or IP — Real Shodan Recon

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