CyberHunter
Local dataset, no network
// Other services

Port 19191: OPSEC UAA

Port 19191 is assigned by IANA to opsec-uaa (OPSEC UAA).

19191

How opsec-uaa works

Other services
client:19191opsec-uaaresponse client:19191opsec-uaaresponse

The client sends a request to port 19191 and the opsec-uaa 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 19191 dangerous?

We have no specific security note for port 19191. 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 19191

ServicePortTransportDescriptionReferenceUpdated
opsec-uaa 19191 TCP, UDP OPSEC UAA - -

// source: IANA service name and port number registry

03 Check it

Which program uses port 19191, and is it reachable?

Linux

sudo ss -ltnup 'sport = :19191'      # process listening on 19191
sudo lsof -nP -i :19191

macOS

sudo lsof -nP -i :19191

Windows (PowerShell)

Get-NetTCPConnection -LocalPort 19191 -State Listen | Select LocalAddress, OwningProcess
Get-NetUDPEndpoint -LocalPort 19191
netstat -ano | findstr :19191

From another machine

nmap -p 19191 -sV <host>
sudo nmap -sU -p 19191 <host>
nc -zv <host> 19191

Block it in the firewall

sudo ufw deny 19191/tcp                                         # Linux (ufw)
New-NetFirewallRule -DisplayName "Block 19191" -Direction Inbound -LocalPort 19191 -Protocol TCP -Action Block  # Windows
04 FAQ
What is port 19191 used for?

Port 19191 is assigned by IANA to opsec-uaa (OPSEC UAA).

Is port 19191 TCP or UDP?

Port 19191 is registered for TCP and UDP.

Is it safe to open port 19191?

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 19191 is open?

On Linux run "ss -ltnup 'sport = :19191'", on macOS "lsof -nP -i :19191", and on Windows "netstat -ano | findstr :19191" to see the local process. From another machine, "nmap -p 19191 <host>" shows whether it is reachable.

05 Related
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