Well-known · Linux/Unix

694 Linux-HA heartbeat

TCP Yes
UDP Yes
SCTP —
DCCP —

What it is

Heartbeat high-availability cluster messaging.

When / why

Cluster node liveness.

Protocol status detail

TransportStatusMeaning
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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Port range

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

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