CyberHunter
Local dataset, no network
// Other services

Port 22001: OptoControl

Port 22001 is assigned by IANA to optocontrol (OptoControl).

22001

How optocontrol works

Other services
client:22001optocontrolresponse client:22001optocontrolresponse

The client sends a request to port 22001 and the optocontrol service answers.

Transport
TCP · UDP
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 22001 dangerous?

We have no specific security note for port 22001. 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 22001

ServicePortTransportDescriptionReferenceUpdated
optocontrol 22001 TCP, UDP OptoControl - -

// source: IANA service name and port number registry

03 Check it

Which program uses port 22001, and is it reachable?

Linux

sudo ss -ltnup 'sport = :22001'      # process listening on 22001
sudo lsof -nP -i :22001

macOS

sudo lsof -nP -i :22001

Windows (PowerShell)

Get-NetTCPConnection -LocalPort 22001 -State Listen | Select LocalAddress, OwningProcess
Get-NetUDPEndpoint -LocalPort 22001
netstat -ano | findstr :22001

From another machine

nmap -p 22001 -sV <host>
sudo nmap -sU -p 22001 <host>
nc -zv <host> 22001

Block it in the firewall

sudo ufw deny 22001/tcp                                         # Linux (ufw)
New-NetFirewallRule -DisplayName "Block 22001" -Direction Inbound -LocalPort 22001 -Protocol TCP -Action Block  # Windows
04 FAQ
What is port 22001 used for?

Port 22001 is assigned by IANA to optocontrol (OptoControl).

Is port 22001 TCP or UDP?

Port 22001 is registered for TCP and UDP.

Is it safe to open port 22001?

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 22001 is open?

On Linux run "ss -ltnup 'sport = :22001'", on macOS "lsof -nP -i :22001", and on Windows "netstat -ano | findstr :22001" to see the local process. From another machine, "nmap -p 22001 <host>" shows whether it is reachable.

05 Related
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