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// Other services

Port 1081: PVUNIWIEN

Port 1081 is assigned by IANA to pvuniwien (PVUNIWIEN).

1081

How pvuniwien works

Other services
client:1081pvuniwienresponse client:1081pvuniwienresponse

The client sends a request to port 1081 and the pvuniwien 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 1081 dangerous?

We have no specific security note for port 1081. 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 1081

ServicePortTransportDescriptionReferenceUpdated
pvuniwien 1081 TCP, UDP PVUNIWIEN - -

// source: IANA service name and port number registry

03 Check it

Which program uses port 1081, and is it reachable?

Linux

sudo ss -ltnup 'sport = :1081'      # process listening on 1081
sudo lsof -nP -i :1081

macOS

sudo lsof -nP -i :1081

Windows (PowerShell)

Get-NetTCPConnection -LocalPort 1081 -State Listen | Select LocalAddress, OwningProcess
Get-NetUDPEndpoint -LocalPort 1081
netstat -ano | findstr :1081

From another machine

nmap -p 1081 -sV <host>
sudo nmap -sU -p 1081 <host>
nc -zv <host> 1081

Block it in the firewall

sudo ufw deny 1081/tcp                                         # Linux (ufw)
New-NetFirewallRule -DisplayName "Block 1081" -Direction Inbound -LocalPort 1081 -Protocol TCP -Action Block  # Windows
04 FAQ
What is port 1081 used for?

Port 1081 is assigned by IANA to pvuniwien (PVUNIWIEN).

Is port 1081 TCP or UDP?

Port 1081 is registered for TCP and UDP.

Is it safe to open port 1081?

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 1081 is open?

On Linux run "ss -ltnup 'sport = :1081'", on macOS "lsof -nP -i :1081", and on Windows "netstat -ano | findstr :1081" to see the local process. From another machine, "nmap -p 1081 <host>" shows whether it is reachable.

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