- 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.
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 accessThe 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
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:
IANA registry entries for port 5231
| Service | Port | Transport | Description | Reference | Updated |
|---|---|---|---|---|---|
| crusecontrol | 5231 | TCP | Remote Control of Scan Software for Cruse Scanners | - | 2014-08-15 |
| - | 5231 | - | Reserved | - | - |
// source: IANA service name and port number registry
Which program uses port 5231, and is it reachable?
Linux
sudo ss -ltnup 'sport = :5231' # process listening on 5231
sudo lsof -nP -i :5231macOS
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
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.
Other remote access ports
: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