Port 17010 (ncpu)

IANA assigns port 17010 to ncpu: Plan 9 cpu port.

Registered (user) port, 1024-49151 TCP

IANA assignment

Service nameProtoDescriptionAssigneeReference

ncpu TCP Plan 9 cpu port
Defined TXT keys: u=username; k=keypattern; f=fstabFILE; n=namespace; h=hostkey; r=root Ronald G Minnich -

Registry dates for this port: registered 2022-05-13.

Linux: is anything listening on TCP 17010?

sudo ss -tlnp 'sport = :17010'

Linux / macOS: which process owns the port

sudo lsof -nP -i :17010

Older Linux / BSD (net-tools)

sudo netstat -tlnp | grep ':17010 '

Windows (Command Prompt)

netstat -ano | findstr :17010

Windows (PowerShell)

Get-NetTCPConnection -LocalPort 17010 -State Listen | Select LocalAddress,OwningProcess

From another machine

nc -vz -w 5 HOST 17010

From Windows

Test-NetConnection HOST -Port 17010

ufw

sudo ufw deny 17010/tcp

iptables

sudo iptables -A INPUT -p tcp --dport 17010 -j DROP

nftables

sudo nft add rule inet filter input tcp dport 17010 drop

Windows Firewall

New-NetFirewallRule -DisplayName 'Block TCP 17010' -Direction Inbound -Protocol TCP -LocalPort 17010 -Action Block

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Assignment data: IANA port number registry (public domain), retrieved 2026-11-10.