Port 7 (Echo Protocol) – TCP/UDP

TCP Yes

UDP Yes

SCTP —

DCCP —

What it is

Echoes back any data it receives.

Legacy connectivity testing. Usually disabled on modern hosts to avoid amplification abuse.

Transport	Status	Meaning
TCP	Yes	Assigned by IANA and standardized, specified, or widely used on this port.
UDP	Yes	Assigned by IANA and standardized, specified, or widely used on this port.
SCTP	—	Not applicable for this transport.
DCCP	—	Not applicable for this transport.

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Well-known (0–1023). System port for a core service. On Unix-like systems, binding it requires superuser privileges.

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