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// Other services

Port 17010: Plan 9 cpu port

Port 17010 is assigned by IANA to ncpu (Plan 9 cpu port).

17010

How ncpu works

Other services
client:17010ncpuresponse client:17010ncpuresponse

The client sends a request to port 17010 and the ncpu service answers.

Transport
TCP
Exposure risk
not rated depends on the program listening
Encryption
Unknownnot stated by the registry
IANA status
Assigned1 registered service
Range
Registered (1024-49151)
Category
Other services
01 Security

Is port 17010 dangerous?

We have no specific security note for port 17010. Its risk depends on the program actually listening on it. General advice for other services services:

  • Close the port if nothing on the host needs it.
  • Identify the process that listens on it (commands below) before opening it in a firewall.
  • Expose a service only to the networks that use it.
02 Registry

IANA registry entries for port 17010

ServicePortTransportDescriptionReferenceUpdated
ncpu 17010 TCP Plan 9 cpu port - 2022-05-13
-17010-Reserved--

// source: IANA service name and port number registry

03 Check it

Which program uses port 17010, and is it reachable?

Linux

sudo ss -ltnup 'sport = :17010'      # process listening on 17010
sudo lsof -nP -i :17010

macOS

sudo lsof -nP -i :17010

Windows (PowerShell)

Get-NetTCPConnection -LocalPort 17010 -State Listen | Select LocalAddress, OwningProcess
Get-NetUDPEndpoint -LocalPort 17010
netstat -ano | findstr :17010

From another machine

nmap -p 17010 -sV <host>
nc -zv <host> 17010

Block it in the firewall

sudo ufw deny 17010/tcp                                         # Linux (ufw)
New-NetFirewallRule -DisplayName "Block 17010" -Direction Inbound -LocalPort 17010 -Protocol TCP -Action Block  # Windows
04 FAQ
What is port 17010 used for?

Port 17010 is assigned by IANA to ncpu (Plan 9 cpu port).

Is port 17010 TCP or UDP?

Port 17010 is registered for TCP.

Is it safe to open port 17010?

It depends on the program that listens on it. Open it only for a service you know and only to the networks that need it. Close the port if nothing on the host needs it.

How do I check if port 17010 is open?

On Linux run "ss -ltnup 'sport = :17010'", on macOS "lsof -nP -i :17010", and on Windows "netstat -ano | findstr :17010" to see the local process. From another machine, "nmap -p 17010 <host>" shows whether it is reachable.

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