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// Other services

Port 8091: Jam Link Framework

Port 8091 is assigned by IANA to jamlink (Jam Link Framework).

8091

How jamlink works

Other services
client:8091jamlinkresponse client:8091jamlinkresponse

The client sends a request to port 8091 and the jamlink 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 8091 dangerous?

We have no specific security note for port 8091. 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 8091

ServicePortTransportDescriptionReferenceUpdated
jamlink 8091 TCP Jam Link Framework - 2009-11-25
-8091-Reserved--

// source: IANA service name and port number registry

03 Check it

Which program uses port 8091, and is it reachable?

Linux

sudo ss -ltnup 'sport = :8091'      # process listening on 8091
sudo lsof -nP -i :8091

macOS

sudo lsof -nP -i :8091

Windows (PowerShell)

Get-NetTCPConnection -LocalPort 8091 -State Listen | Select LocalAddress, OwningProcess
Get-NetUDPEndpoint -LocalPort 8091
netstat -ano | findstr :8091

From another machine

nmap -p 8091 -sV <host>
nc -zv <host> 8091

Block it in the firewall

sudo ufw deny 8091/tcp                                         # Linux (ufw)
New-NetFirewallRule -DisplayName "Block 8091" -Direction Inbound -LocalPort 8091 -Protocol TCP -Action Block  # Windows
04 FAQ
What is port 8091 used for?

Port 8091 is assigned by IANA to jamlink (Jam Link Framework).

Is port 8091 TCP or UDP?

Port 8091 is registered for TCP.

Is it safe to open port 8091?

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 8091 is open?

On Linux run "ss -ltnup 'sport = :8091'", on macOS "lsof -nP -i :8091", and on Windows "netstat -ano | findstr :8091" to see the local process. From another machine, "nmap -p 8091 <host>" shows whether it is reachable.

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