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// Other services

Port 13823: Blackmagic Design Streaming Server

Port 13823 is assigned by IANA to bmdss (Blackmagic Design Streaming Server).

13823

How bmdss works

Other services
client:13823bmdssresponse client:13823bmdssresponse

The client sends a request to port 13823 and the bmdss service answers.

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
Other services
01 Security

Is port 13823 dangerous?

We have no specific security note for port 13823. 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 13823

ServicePortTransportDescriptionReferenceUpdated
bmdss 13823 TCP Blackmagic Design Streaming Server - 2011-03-01
-13823-Reserved--

// source: IANA service name and port number registry

03 Check it

Which program uses port 13823, and is it reachable?

Linux

sudo ss -ltnup 'sport = :13823'      # process listening on 13823
sudo lsof -nP -i :13823

macOS

sudo lsof -nP -i :13823

Windows (PowerShell)

Get-NetTCPConnection -LocalPort 13823 -State Listen | Select LocalAddress, OwningProcess
Get-NetUDPEndpoint -LocalPort 13823
netstat -ano | findstr :13823

From another machine

nmap -p 13823 -sV <host>
nc -zv <host> 13823

Block it in the firewall

sudo ufw deny 13823/tcp                                         # Linux (ufw)
New-NetFirewallRule -DisplayName "Block 13823" -Direction Inbound -LocalPort 13823 -Protocol TCP -Action Block  # Windows
04 FAQ
What is port 13823 used for?

Port 13823 is assigned by IANA to bmdss (Blackmagic Design Streaming Server).

Is port 13823 TCP or UDP?

Port 13823 is registered for TCP.

Is it safe to open port 13823?

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 13823 is open?

On Linux run "ss -ltnup 'sport = :13823'", on macOS "lsof -nP -i :13823", and on Windows "netstat -ano | findstr :13823" to see the local process. From another machine, "nmap -p 13823 <host>" shows whether it is reachable.

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