Registered · Cross-platform

20000 DNP3 / Usermin

TCP Yes
UDP —
SCTP —
DCCP —

What it is

DNP3 SCADA protocol; also Usermin.

When / why

Power/utility SCADA control. Strictly segment OT networks.

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.
« 19999 DNP3 Secure / Netdata 22000 Syncthing »

Port range

Registered (1024–49151). Assigned by IANA on request; usable without elevated privileges on most systems.

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