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What are the default ports for FTP ( File Transfer Protocol ), Telnet, HTTP ( Hypertext transfer protocol ), NTP ( Network time protocol ), Modbus TCP Protocol.

The port numbers in the range from 0 to 1023 are the well-known ports. They are used by system processes that
provide widely used types of network services. The default ports are as below.
FTP >> Port 21
HTTP >> Port 80
Modbus TCP >> 502
NTP >> 123
Telnet >> 23
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