Open or Accepted: The host sent a reply indicating that a service is listening on the port.The result of a scan on a port is usually generalized into one of three categories: Some port scanners scan only the most common port numbers, or ports most commonly associated with vulnerable services, on a given host. (Port zero is not a usable port number.) Most services use one, or at most a limited range of, port numbers. There are 65535 distinct and usable port numbers, numbered 1.65535. In this system, network services are referenced using two components: a host address and a port number. The design and operation of the Internet is based on the Internet Protocol Suite, commonly also called TCP/IP.
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