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// Other services

Port 12865: control port for the netperf benchmark

Port 12865 is assigned by IANA to netperf (control port for the netperf benchmark).

12865

How netperf works

Other services
client:12865netperfresponse client:12865netperfresponse

The client sends a request to port 12865 and the netperf 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 12865 dangerous?

We have no specific security note for port 12865. 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 12865

ServicePortTransportDescriptionReferenceUpdated
netperf 12865 TCP control port for the netperf benchmark - 2013-04-05
-12865-Reserved--

// source: IANA service name and port number registry

03 Check it

Which program uses port 12865, and is it reachable?

Linux

sudo ss -ltnup 'sport = :12865'      # process listening on 12865
sudo lsof -nP -i :12865

macOS

sudo lsof -nP -i :12865

Windows (PowerShell)

Get-NetTCPConnection -LocalPort 12865 -State Listen | Select LocalAddress, OwningProcess
Get-NetUDPEndpoint -LocalPort 12865
netstat -ano | findstr :12865

From another machine

nmap -p 12865 -sV <host>
nc -zv <host> 12865

Block it in the firewall

sudo ufw deny 12865/tcp                                         # Linux (ufw)
New-NetFirewallRule -DisplayName "Block 12865" -Direction Inbound -LocalPort 12865 -Protocol TCP -Action Block  # Windows
04 FAQ
What is port 12865 used for?

Port 12865 is assigned by IANA to netperf (control port for the netperf benchmark).

Is port 12865 TCP or UDP?

Port 12865 is registered for TCP.

Is it safe to open port 12865?

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 12865 is open?

On Linux run "ss -ltnup 'sport = :12865'", on macOS "lsof -nP -i :12865", and on Windows "netstat -ano | findstr :12865" to see the local process. From another machine, "nmap -p 12865 <host>" shows whether it is reachable.

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