Port 17010Plan 9 CPU server

TCP port 17010 is used by Plan 9 CPU servers for authenticated remote command and shell sessions.

transport: tcp
in transit: cleartext
assignment: official
risk: 6/10
lookups: 0

also known as ncpu, cpu

Technical Details

what runs on :17010

The service uses TCP and speaks the Plan 9 CPU-session protocol, rather than HTTP or a generic 9P file-server exchange. A connection performs Plan 9 authentication and session setup, then carries remote command or shell I/O and related namespace setup over the connection. Authentication is not the same as transport encryption: encryption may be available in particular implementations or configurations, but it is not inherent to the port’s normal traffic.

Security Information

exposure of :17010

risk score

6/ 10risk

treat as sensitive. widely scanned and regularly exploited when reachable — restrict it to known sources.

remote access averages 4.0 across 237 ports — this one sits 2.0 above.

in transit

cleartext

credentials and payloads are readable by anyone on path

assignment

official

registered with iana for this service — scanners fingerprint it by number

reachable over

tcp

every listening transport is another surface to filter at the edge

security overview

This is a remote command-execution service, so an exposed instance should be limited to trusted networks and protected by sound Plan 9 authentication. The session is not encrypted by default, and the service’s low prevalence should not be mistaken for a security boundary; an internet-facing listener can still provide a path to execute commands as an authenticated user.

Record

iana registry entry

port: :17010
service: Plan 9 CPU server
transport: TCP
encryption: cleartext
assignment: iana registered
risk: 6/10risk
category: Remote Access System
usage: A Plan 9 `cpu` client connects here to run commands or a shell on a CPU server, with the session tied into Plan 9’s authentication and namespace model. It is a niche Plan 9 service, not a general-purpose shell protocol such as SSH.
lookups: 0rank 993
added: 2026-10-17
updated: 2026-10-17
references: IANA service name registry — port 17010

Something wrong?

This record is maintained by the engineers who use port 17010. Every field on it is editable — change what's wrong, say how you know, and a reviewer publishes it, usually within a minute. Last touched 2026-10-17.

01edit any field on a page of its own
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edit this record →back to the registry

Related Ports

all 237 in remote access →

the 8 most looked-up other ports in remote access — 237 ports carry that label.

port	service	proto	category	risk	views
:8000	Intel Remote Desktop / Alternate HTTP Port	TCP	Web Services	safe	84.3k
:8888	D2GS Admin Console	TCP	Remote Access	caution	83.7k
:8881	Atlasz Secure Server	TCP	Web Services	caution	67.6k
:5938	TeamViewer	TCPUDP	Remote Access	caution	65.0k
:8291	Winbox MikroTik Admin	TCP	Security	caution	62.9k
:8008	IBM HTTP Server Admin	TCP	Web Services	caution	58.3k
:135	Microsoft EPMAP	TCPUDP	Security	caution	51.9k
:23	Telnet	TCP	Remote Access	caution	34.8k

risk mix of the 8 listed

safe13%
caution88%

0 of 8 encrypted

Port :17010Plan 9 CPU server

Technical Details

Security Information

Related Ports

Port 17010Plan 9 CPU server