To search for open ports in one step, use the telnet command loop. Syntax: - For /L % i in ([start port], [step], [end port]) do telnet [IP address] %i, To search for open range of port\s using the company URL for a specific accepted protocols (TCP,UDP) running behind the port, type: - portqry –n [URL] –p [protocol] –[port representation] port number, To check if a TCP port is open or reachable is to use the telnet command.Syntax: - telnet [Host URL] [Port number] or telnet [IP address] [Specific port],

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