PORT NUMBERS & ASSIGNMENTS

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The port numbers are divided into three ranges: the Well Known Ports,
the Registered Ports, and the Dynamic and/or Private Ports.

The range for assigned ports managed by the IANA is 0-1023.

Port Assignments can be found here:
http://www.iana.org/assignments/port-numbers

Nbtstat

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The nbtstat – a < name > or nbtstat – a < IP address > command performs a NetBIOS adapter status command on the computer name specified by < name >.

The nbtstat – c option shows the contents of the NetBIOS name cache, which contains NetBIOS name-to-IP address mappings.

nbtstat -n displays the names that have been registered locally on the system by NetBIOS applications such as the server and redirector.