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Port 2186 (gtaua)

IANA assigns port 2186 to gtaua: Guy-Tek Automated Update Applications.

Registered (user) port, 1024-49151 TCPUDP

IANA assignment

Service nameProtoDescriptionAssigneeReference
gtaua TCP Guy-Tek Automated Update Applications Daniel Story -
gtaua UDP Guy-Tek Automated Update Applications Daniel Story -

Registry dates for this port: registered 2008-01-25.

Check what is listening on port 2186

Linux: is anything listening on TCP 2186?
sudo ss -tlnp 'sport = :2186'
Linux: UDP 2186
sudo ss -ulnp 'sport = :2186'
Linux / macOS: which process owns the port
sudo lsof -nP -i :2186
Older Linux / BSD (net-tools)
sudo netstat -tlnp | grep ':2186 '
Windows (Command Prompt)
netstat -ano | findstr :2186
Windows (PowerShell)
Get-NetTCPConnection -LocalPort 2186 -State Listen | Select LocalAddress,OwningProcess

Test it from outside

From another machine
nc -vz -w 5 HOST 2186
From Windows
Test-NetConnection HOST -Port 2186
UDP probe (no reply does not prove it is closed)
nc -vzu -w 5 HOST 2186

Block port 2186 in the firewall

ufw
sudo ufw deny 2186/tcp
iptables
sudo iptables -A INPUT -p tcp --dport 2186 -j DROP
nftables
sudo nft add rule inet filter input tcp dport 2186 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block TCP 2186' -Direction Inbound -Protocol TCP -LocalPort 2186 -Action Block
ufw
sudo ufw deny 2186/udp
iptables
sudo iptables -A INPUT -p udp --dport 2186 -j DROP
nftables
sudo nft add rule inet filter input udp dport 2186 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block UDP 2186' -Direction Inbound -Protocol UDP -LocalPort 2186 -Action Block

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Assignment data: IANA port number registry (public domain), retrieved 2026-11-10.