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Port 25576 (sauterdongle)

IANA assigns port 25576 to sauterdongle: Sauter Dongle.

Registered (user) port, 1024-49151 TCP

IANA assignment

Service nameProtoDescriptionAssigneeReference
sauterdongle TCP Sauter Dongle Christian Brecht -

Registry dates for this port: registered 2010-12-15.

Check what is listening on port 25576

Linux: is anything listening on TCP 25576?
sudo ss -tlnp 'sport = :25576'
Linux / macOS: which process owns the port
sudo lsof -nP -i :25576
Older Linux / BSD (net-tools)
sudo netstat -tlnp | grep ':25576 '
Windows (Command Prompt)
netstat -ano | findstr :25576
Windows (PowerShell)
Get-NetTCPConnection -LocalPort 25576 -State Listen | Select LocalAddress,OwningProcess

Test it from outside

From another machine
nc -vz -w 5 HOST 25576
From Windows
Test-NetConnection HOST -Port 25576

Block port 25576 in the firewall

ufw
sudo ufw deny 25576/tcp
iptables
sudo iptables -A INPUT -p tcp --dport 25576 -j DROP
nftables
sudo nft add rule inet filter input tcp dport 25576 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block TCP 25576' -Direction Inbound -Protocol TCP -LocalPort 25576 -Action Block

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