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// Other services

Port 22335: Initium Labs Security and Automation Control

Port 22335 is assigned by IANA to shrewd-control (Initium Labs Security and Automation Control), shrewd-stream (Initium Labs Security and Automation Streaming).

22335

How shrewd-control works

Other services
client:22335shrewd-controlresponse client:22335shrewd-controlresponse

The client sends a request to port 22335 and the shrewd-control service answers.

Transport
TCP · UDP
Exposure risk
not rated depends on the program listening
Encryption
Unknownnot stated by the registry
IANA status
Assigned2 registered services
Range
Registered (1024-49151)
Category
Other services
01 Security

Is port 22335 dangerous?

We have no specific security note for port 22335. 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 22335

ServicePortTransportDescriptionReferenceUpdated
shrewd-control 22335 TCP Initium Labs Security and Automation Control - 2015-03-06
shrewd-stream 22335 UDP Initium Labs Security and Automation Streaming - 2015-03-06

// source: IANA service name and port number registry

03 Check it

Which program uses port 22335, and is it reachable?

Linux

sudo ss -ltnup 'sport = :22335'      # process listening on 22335
sudo lsof -nP -i :22335

macOS

sudo lsof -nP -i :22335

Windows (PowerShell)

Get-NetTCPConnection -LocalPort 22335 -State Listen | Select LocalAddress, OwningProcess
Get-NetUDPEndpoint -LocalPort 22335
netstat -ano | findstr :22335

From another machine

nmap -p 22335 -sV <host>
sudo nmap -sU -p 22335 <host>
nc -zv <host> 22335

Block it in the firewall

sudo ufw deny 22335/tcp                                         # Linux (ufw)
New-NetFirewallRule -DisplayName "Block 22335" -Direction Inbound -LocalPort 22335 -Protocol TCP -Action Block  # Windows
04 FAQ
What is port 22335 used for?

Port 22335 is assigned by IANA to shrewd-control (Initium Labs Security and Automation Control), shrewd-stream (Initium Labs Security and Automation Streaming).

Is port 22335 TCP or UDP?

Port 22335 is registered for TCP and UDP.

Is it safe to open port 22335?

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 22335 is open?

On Linux run "ss -ltnup 'sport = :22335'", on macOS "lsof -nP -i :22335", and on Windows "netstat -ano | findstr :22335" to see the local process. From another machine, "nmap -p 22335 <host>" shows whether it is reachable.

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