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// Other services

Port 9747: L5NAS Parallel Channel

Port 9747 is assigned by IANA to l5nas-parchan (L5NAS Parallel Channel).

9747

How l5nas-parchan works

Other services
client:9747l5nas-parchanresponse client:9747l5nas-parchanresponse

The client sends a request to port 9747 and the l5nas-parchan 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 9747 dangerous?

We have no specific security note for port 9747. 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 9747

ServicePortTransportDescriptionReferenceUpdated
l5nas-parchan 9747 TCP, UDP L5NAS Parallel Channel - 2002-03

// source: IANA service name and port number registry

03 Check it

Which program uses port 9747, and is it reachable?

Linux

sudo ss -ltnup 'sport = :9747'      # process listening on 9747
sudo lsof -nP -i :9747

macOS

sudo lsof -nP -i :9747

Windows (PowerShell)

Get-NetTCPConnection -LocalPort 9747 -State Listen | Select LocalAddress, OwningProcess
Get-NetUDPEndpoint -LocalPort 9747
netstat -ano | findstr :9747

From another machine

nmap -p 9747 -sV <host>
sudo nmap -sU -p 9747 <host>
nc -zv <host> 9747

Block it in the firewall

sudo ufw deny 9747/tcp                                         # Linux (ufw)
New-NetFirewallRule -DisplayName "Block 9747" -Direction Inbound -LocalPort 9747 -Protocol TCP -Action Block  # Windows
04 FAQ
What is port 9747 used for?

Port 9747 is assigned by IANA to l5nas-parchan (L5NAS Parallel Channel).

Is port 9747 TCP or UDP?

Port 9747 is registered for TCP and UDP.

Is it safe to open port 9747?

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 9747 is open?

On Linux run "ss -ltnup 'sport = :9747'", on macOS "lsof -nP -i :9747", and on Windows "netstat -ano | findstr :9747" to see the local process. From another machine, "nmap -p 9747 <host>" shows whether it is reachable.

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