Well-known · Cross-platform

259 ESRO

TCP Yes
UDP —
SCTP —
DCCP —

What it is

Efficient Short Remote Operations.

When / why

Historic.

Protocol status detail

TransportStatusMeaning
TCP Yes Assigned by IANA and standardized, specified, or widely used on this port.
UDP — Not applicable for this transport.
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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