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// Other services

Port 5633: BE Operations Request Listener

Port 5633 is assigned by IANA to beorl (BE Operations Request Listener).

5633

How beorl works

Other services
client:5633beorlresponse client:5633beorlresponse

The client sends a request to port 5633 and the beorl 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 5633 dangerous?

We have no specific security note for port 5633. 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 5633

ServicePortTransportDescriptionReferenceUpdated
beorl 5633 TCP, UDP BE Operations Request Listener - 2006-02

// source: IANA service name and port number registry

03 Check it

Which program uses port 5633, and is it reachable?

Linux

sudo ss -ltnup 'sport = :5633'      # process listening on 5633
sudo lsof -nP -i :5633

macOS

sudo lsof -nP -i :5633

Windows (PowerShell)

Get-NetTCPConnection -LocalPort 5633 -State Listen | Select LocalAddress, OwningProcess
Get-NetUDPEndpoint -LocalPort 5633
netstat -ano | findstr :5633

From another machine

nmap -p 5633 -sV <host>
sudo nmap -sU -p 5633 <host>
nc -zv <host> 5633

Block it in the firewall

sudo ufw deny 5633/tcp                                         # Linux (ufw)
New-NetFirewallRule -DisplayName "Block 5633" -Direction Inbound -LocalPort 5633 -Protocol TCP -Action Block  # Windows
04 FAQ
What is port 5633 used for?

Port 5633 is assigned by IANA to beorl (BE Operations Request Listener).

Is port 5633 TCP or UDP?

Port 5633 is registered for TCP and UDP.

Is it safe to open port 5633?

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 5633 is open?

On Linux run "ss -ltnup 'sport = :5633'", on macOS "lsof -nP -i :5633", and on Windows "netstat -ano | findstr :5633" to see the local process. From another machine, "nmap -p 5633 <host>" shows whether it is reachable.

05 Related
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