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// Remote access

Port 5231: Remote Control of Scan Software for Cruse Scanners

Port 5231 is assigned by IANA to crusecontrol (Remote Control of Scan Software for Cruse Scanners).

5231

How crusecontrol works

Remote access
terminal:5231crusecontrol terminal:5231crusecontrol

The client opens a session to port 5231: each command typed is sent to the server, which runs it and returns the output.

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
Remote access
01 Security

Is port 5231 dangerous?

We have no specific security note for port 5231. Its risk depends on the program actually listening on it. General advice for remote access services:

  • Do not expose remote administration directly: use a VPN or a zero-trust access proxy.
  • Require MFA or key-based authentication and lock out brute-force attempts.
  • Log every login and alert on new source addresses.
02 Registry

IANA registry entries for port 5231

ServicePortTransportDescriptionReferenceUpdated
crusecontrol 5231 TCP Remote Control of Scan Software for Cruse Scanners - 2014-08-15
-5231-Reserved--

// source: IANA service name and port number registry

03 Check it

Which program uses port 5231, and is it reachable?

Linux

sudo ss -ltnup 'sport = :5231'      # process listening on 5231
sudo lsof -nP -i :5231

macOS

sudo lsof -nP -i :5231

Windows (PowerShell)

Get-NetTCPConnection -LocalPort 5231 -State Listen | Select LocalAddress, OwningProcess
Get-NetUDPEndpoint -LocalPort 5231
netstat -ano | findstr :5231

From another machine

nmap -p 5231 -sV <host>
nc -zv <host> 5231

Block it in the firewall

sudo ufw deny 5231/tcp                                         # Linux (ufw)
New-NetFirewallRule -DisplayName "Block 5231" -Direction Inbound -LocalPort 5231 -Protocol TCP -Action Block  # Windows
04 FAQ
What is port 5231 used for?

Port 5231 is assigned by IANA to crusecontrol (Remote Control of Scan Software for Cruse Scanners).

Is port 5231 TCP or UDP?

Port 5231 is registered for TCP.

Is it safe to open port 5231?

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. Do not expose remote administration directly: use a VPN or a zero-trust access proxy.

How do I check if port 5231 is open?

On Linux run "ss -ltnup 'sport = :5231'", on macOS "lsof -nP -i :5231", and on Windows "netstat -ano | findstr :5231" to see the local process. From another machine, "nmap -p 5231 <host>" shows whether it is reachable.

05 Related
:22 SSH tcp · udp · sctp · moderate risk :3389 RDP tcp · udp · critical risk :23 Telnet tcp · udp · critical risk :5900 VNC tcp · udp · critical risk :5985 WinRM (HTTP) tcp · udp · high risk :5986 WinRM (HTTPS) tcp · udp · high risk :10000 Webmin tcp · udp · high risk :89 SU/MIT Telnet Gateway tcp · udp

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