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// Other services

Port 2186: Guy-Tek Automated Update Applications

Port 2186 is assigned by IANA to gtaua (Guy-Tek Automated Update Applications).

2186

How gtaua works

Other services
client:2186gtauaresponse client:2186gtauaresponse

The client sends a request to port 2186 and the gtaua 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 2186 dangerous?

We have no specific security note for port 2186. 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 2186

ServicePortTransportDescriptionReferenceUpdated
gtaua 2186 TCP, UDP Guy-Tek Automated Update Applications - 2008-01-25

// source: IANA service name and port number registry

03 Check it

Which program uses port 2186, and is it reachable?

Linux

sudo ss -ltnup 'sport = :2186'      # process listening on 2186
sudo lsof -nP -i :2186

macOS

sudo lsof -nP -i :2186

Windows (PowerShell)

Get-NetTCPConnection -LocalPort 2186 -State Listen | Select LocalAddress, OwningProcess
Get-NetUDPEndpoint -LocalPort 2186
netstat -ano | findstr :2186

From another machine

nmap -p 2186 -sV <host>
sudo nmap -sU -p 2186 <host>
nc -zv <host> 2186

Block it in the firewall

sudo ufw deny 2186/tcp                                         # Linux (ufw)
New-NetFirewallRule -DisplayName "Block 2186" -Direction Inbound -LocalPort 2186 -Protocol TCP -Action Block  # Windows
04 FAQ
What is port 2186 used for?

Port 2186 is assigned by IANA to gtaua (Guy-Tek Automated Update Applications).

Is port 2186 TCP or UDP?

Port 2186 is registered for TCP and UDP.

Is it safe to open port 2186?

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 2186 is open?

On Linux run "ss -ltnup 'sport = :2186'", on macOS "lsof -nP -i :2186", and on Windows "netstat -ano | findstr :2186" to see the local process. From another machine, "nmap -p 2186 <host>" shows whether it is reachable.

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