well, port scanning on a website, might not be the actual web server. many companies have a port forewarding setup on a internet gateway box so if anybody sends requests @ port 80 (http) it will foreward the packets to the webserver inside the lan, and the server will respond and those packets will get sent back into the internet.
Now if you want to scan ports on a computer inside your network (or school network). Keep in minds net admins will be able to detect it and you might get in serious trouble. Hence the term "Scan my network and die"
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