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// Other services

Port 5568: Session Data Transport Multicast

Port 5568 is assigned by IANA to sdt (Session Data Transport Multicast).

5568

How sdt works

Other services
client:5568sdtresponse client:5568sdtresponse

The client sends a request to port 5568 and the sdt 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 5568 dangerous?

We have no specific security note for port 5568. 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 5568

ServicePortTransportDescriptionReferenceUpdated
sdt 5568 TCP, UDP Session Data Transport Multicast - 2006-05

// source: IANA service name and port number registry

03 Check it

Which program uses port 5568, and is it reachable?

Linux

sudo ss -ltnup 'sport = :5568'      # process listening on 5568
sudo lsof -nP -i :5568

macOS

sudo lsof -nP -i :5568

Windows (PowerShell)

Get-NetTCPConnection -LocalPort 5568 -State Listen | Select LocalAddress, OwningProcess
Get-NetUDPEndpoint -LocalPort 5568
netstat -ano | findstr :5568

From another machine

nmap -p 5568 -sV <host>
sudo nmap -sU -p 5568 <host>
nc -zv <host> 5568

Block it in the firewall

sudo ufw deny 5568/tcp                                         # Linux (ufw)
New-NetFirewallRule -DisplayName "Block 5568" -Direction Inbound -LocalPort 5568 -Protocol TCP -Action Block  # Windows
04 FAQ
What is port 5568 used for?

Port 5568 is assigned by IANA to sdt (Session Data Transport Multicast).

Is port 5568 TCP or UDP?

Port 5568 is registered for TCP and UDP.

Is it safe to open port 5568?

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 5568 is open?

On Linux run "ss -ltnup 'sport = :5568'", on macOS "lsof -nP -i :5568", and on Windows "netstat -ano | findstr :5568" to see the local process. From another machine, "nmap -p 5568 <host>" shows whether it is reachable.

05 Related
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