To exploit a service on a port, a hacker would banner grab for the software and version. There are 65,535 total allocated ports in TCP/UDP. A port is just an opening that a service uses as a communications endpoint. Your computer runs services like media sharing on what are called ports. So how are hackers using just an address to get into your computer and make your life hell? This is one of the reasons proxies and anonymity services exist, to protect people from learning your IP address. I'm sure at one time or another you've heard that hackers can hack your computer via your IP address. Anyone in the world can contact your computer through its IP address, and send a retrieve information with it. Your IP ( Internet Protocol) address is your unique ID on the internet.
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