Registered · Cross-platform

31337 Back Orifice / ncat

TCP Unofficial
UDP —
SCTP —
DCCP —

What it is

Back Orifice remote-admin trojan; ncat default.

When / why

Classic malware/backdoor indicator — investigate any listener.

Protocol status detail

TransportStatusMeaning
TCP Unofficial Not assigned by IANA, but 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

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

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