CyberHunter
Local dataset, no network
// Other services

Port 9536: Surveillance buffering function

Port 9536 is assigned by IANA to laes-bf (Surveillance buffering function).

9536

How laes-bf works

Other services
client:9536laes-bfresponse client:9536laes-bfresponse

The client sends a request to port 9536 and the laes-bf 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 9536 dangerous?

We have no specific security note for port 9536. 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 9536

ServicePortTransportDescriptionReferenceUpdated
laes-bf 9536 TCP, UDP Surveillance buffering function - 2007-05

// source: IANA service name and port number registry

03 Check it

Which program uses port 9536, and is it reachable?

Linux

sudo ss -ltnup 'sport = :9536'      # process listening on 9536
sudo lsof -nP -i :9536

macOS

sudo lsof -nP -i :9536

Windows (PowerShell)

Get-NetTCPConnection -LocalPort 9536 -State Listen | Select LocalAddress, OwningProcess
Get-NetUDPEndpoint -LocalPort 9536
netstat -ano | findstr :9536

From another machine

nmap -p 9536 -sV <host>
sudo nmap -sU -p 9536 <host>
nc -zv <host> 9536

Block it in the firewall

sudo ufw deny 9536/tcp                                         # Linux (ufw)
New-NetFirewallRule -DisplayName "Block 9536" -Direction Inbound -LocalPort 9536 -Protocol TCP -Action Block  # Windows
04 FAQ
What is port 9536 used for?

Port 9536 is assigned by IANA to laes-bf (Surveillance buffering function).

Is port 9536 TCP or UDP?

Port 9536 is registered for TCP and UDP.

Is it safe to open port 9536?

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 9536 is open?

On Linux run "ss -ltnup 'sport = :9536'", on macOS "lsof -nP -i :9536", and on Windows "netstat -ano | findstr :9536" to see the local process. From another machine, "nmap -p 9536 <host>" shows whether it is reachable.

05 Related
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