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// Other services

Port 9081: Required for Adaptive Quality of Service

Port 9081 is assigned by IANA to cisco-aqos (Required for Adaptive Quality of Service).

9081

How cisco-aqos works

Other services
client:9081cisco-aqosresponse client:9081cisco-aqosresponse

The client sends a request to port 9081 and the cisco-aqos service answers.

Transport
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 9081 dangerous?

We have no specific security note for port 9081. 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 9081

ServicePortTransportDescriptionReferenceUpdated
cisco-aqos 9081 UDP Required for Adaptive Quality of Service - 2017-10-27
-9081-Reserved--

// source: IANA service name and port number registry

03 Check it

Which program uses port 9081, and is it reachable?

Linux

sudo ss -ltnup 'sport = :9081'      # process listening on 9081
sudo lsof -nP -i :9081

macOS

sudo lsof -nP -i :9081

Windows (PowerShell)

Get-NetTCPConnection -LocalPort 9081 -State Listen | Select LocalAddress, OwningProcess
Get-NetUDPEndpoint -LocalPort 9081
netstat -ano | findstr :9081

From another machine

nmap -p 9081 -sV <host>
sudo nmap -sU -p 9081 <host>
nc -zv <host> 9081

Block it in the firewall

sudo ufw deny 9081/udp                                         # Linux (ufw)
New-NetFirewallRule -DisplayName "Block 9081" -Direction Inbound -LocalPort 9081 -Protocol UDP -Action Block  # Windows
04 FAQ
What is port 9081 used for?

Port 9081 is assigned by IANA to cisco-aqos (Required for Adaptive Quality of Service).

Is port 9081 TCP or UDP?

Port 9081 is registered for UDP.

Is it safe to open port 9081?

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 9081 is open?

On Linux run "ss -ltnup 'sport = :9081'", on macOS "lsof -nP -i :9081", and on Windows "netstat -ano | findstr :9081" to see the local process. From another machine, "nmap -p 9081 <host>" shows whether it is reachable.

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