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// Other services

Port 22002: Opto Host Port 2

Port 22002 is assigned by IANA to optohost002 (Opto Host Port 2).

22002

How optohost002 works

Other services
client:22002optohost002response client:22002optohost002response

The client sends a request to port 22002 and the optohost002 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 22002 dangerous?

We have no specific security note for port 22002. 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 22002

ServicePortTransportDescriptionReferenceUpdated
optohost002 22002 TCP, UDP Opto Host Port 2 - 2006-09

// source: IANA service name and port number registry

03 Check it

Which program uses port 22002, and is it reachable?

Linux

sudo ss -ltnup 'sport = :22002'      # process listening on 22002
sudo lsof -nP -i :22002

macOS

sudo lsof -nP -i :22002

Windows (PowerShell)

Get-NetTCPConnection -LocalPort 22002 -State Listen | Select LocalAddress, OwningProcess
Get-NetUDPEndpoint -LocalPort 22002
netstat -ano | findstr :22002

From another machine

nmap -p 22002 -sV <host>
sudo nmap -sU -p 22002 <host>
nc -zv <host> 22002

Block it in the firewall

sudo ufw deny 22002/tcp                                         # Linux (ufw)
New-NetFirewallRule -DisplayName "Block 22002" -Direction Inbound -LocalPort 22002 -Protocol TCP -Action Block  # Windows
04 FAQ
What is port 22002 used for?

Port 22002 is assigned by IANA to optohost002 (Opto Host Port 2).

Is port 22002 TCP or UDP?

Port 22002 is registered for TCP and UDP.

Is it safe to open port 22002?

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 22002 is open?

On Linux run "ss -ltnup 'sport = :22002'", on macOS "lsof -nP -i :22002", and on Windows "netstat -ano | findstr :22002" to see the local process. From another machine, "nmap -p 22002 <host>" shows whether it is reachable.

05 Related
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