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// Other services

Port 22004: Opto Host Port 4

Port 22004 is assigned by IANA to optohost004 (Opto Host Port 4).

22004

How optohost004 works

Other services
client:22004optohost004response client:22004optohost004response

The client sends a request to port 22004 and the optohost004 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 22004 dangerous?

We have no specific security note for port 22004. 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 22004

ServicePortTransportDescriptionReferenceUpdated
optohost004 22004 TCP, UDP Opto Host Port 4 - 2006-09

// source: IANA service name and port number registry

03 Check it

Which program uses port 22004, and is it reachable?

Linux

sudo ss -ltnup 'sport = :22004'      # process listening on 22004
sudo lsof -nP -i :22004

macOS

sudo lsof -nP -i :22004

Windows (PowerShell)

Get-NetTCPConnection -LocalPort 22004 -State Listen | Select LocalAddress, OwningProcess
Get-NetUDPEndpoint -LocalPort 22004
netstat -ano | findstr :22004

From another machine

nmap -p 22004 -sV <host>
sudo nmap -sU -p 22004 <host>
nc -zv <host> 22004

Block it in the firewall

sudo ufw deny 22004/tcp                                         # Linux (ufw)
New-NetFirewallRule -DisplayName "Block 22004" -Direction Inbound -LocalPort 22004 -Protocol TCP -Action Block  # Windows
04 FAQ
What is port 22004 used for?

Port 22004 is assigned by IANA to optohost004 (Opto Host Port 4).

Is port 22004 TCP or UDP?

Port 22004 is registered for TCP and UDP.

Is it safe to open port 22004?

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 22004 is open?

On Linux run "ss -ltnup 'sport = :22004'", on macOS "lsof -nP -i :22004", and on Windows "netstat -ano | findstr :22004" to see the local process. From another machine, "nmap -p 22004 <host>" shows whether it is reachable.

05 Related
:4444 Metasploit default / krb524 tcp · udp · high risk :31337 Back Orifice / elite tcp · udp · high risk :1 TCP Port Service Multiplexer tcp · udp :5 Remote Job Entry tcp · udp :9 Discard tcp · udp · sctp · dccp :11 Active Users tcp · udp :17 Quote of the Day tcp · udp :18 Message Send Protocol (historic) tcp · udp

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