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How to identify protocol using port number?

I know the port number say for example 9995. How to identify what protocol is used by this port number?
Posted 10-Mar-13 20:39pm

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Solution 1

Port numbers are arbitrary and have no connection to protocols, you can host web pages on port 110 for example.

Generally port numbers are reserved for specific uses like 25=smtp, 110=pop3, 80=http etc. see :[^]

To determine a protocol on a specific port number you need to do packet sniffing which is an advanced topic.

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