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TCP UDP Ports


Official List

Port 25

Ports those registered with IANA are shown as official ports. The same port number may be unofficialy used by various services or applications. The official usage are listed separately below its usage may change from time to time.

Official

Port Protocol (TCP/UDP) Title Description Port Type
Port 25 tcp smtp Simple Mail Transfer WELL KNOWN PORT
Port 25 udp smtp Simple Mail Transfer WELL KNOWN PORT

UnOfficial

Unofficialy or sometimes with conflict, the same port may be used by different applications.

Port Protocol (TCP/UDP) Description