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Port 6566 (sane-port)

IANA assigns port 6566 to sane-port: SANE Control Port.

Registered (user) port, 1024-49151 TCPUDP

IANA assignment

Service nameProtoDescriptionAssigneeReference
sane-port TCP SANE Control Port Henning Meier Geinit -
sane-port UDP SANE Control Port Henning Meier Geinit -

Registry dates for this port: registered 2002-10.

Check what is listening on port 6566

Linux: is anything listening on TCP 6566?
sudo ss -tlnp 'sport = :6566'
Linux: UDP 6566
sudo ss -ulnp 'sport = :6566'
Linux / macOS: which process owns the port
sudo lsof -nP -i :6566
Older Linux / BSD (net-tools)
sudo netstat -tlnp | grep ':6566 '
Windows (Command Prompt)
netstat -ano | findstr :6566
Windows (PowerShell)
Get-NetTCPConnection -LocalPort 6566 -State Listen | Select LocalAddress,OwningProcess

Test it from outside

From another machine
nc -vz -w 5 HOST 6566
From Windows
Test-NetConnection HOST -Port 6566
UDP probe (no reply does not prove it is closed)
nc -vzu -w 5 HOST 6566

Block port 6566 in the firewall

ufw
sudo ufw deny 6566/tcp
iptables
sudo iptables -A INPUT -p tcp --dport 6566 -j DROP
nftables
sudo nft add rule inet filter input tcp dport 6566 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block TCP 6566' -Direction Inbound -Protocol TCP -LocalPort 6566 -Action Block
ufw
sudo ufw deny 6566/udp
iptables
sudo iptables -A INPUT -p udp --dport 6566 -j DROP
nftables
sudo nft add rule inet filter input udp dport 6566 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block UDP 6566' -Direction Inbound -Protocol UDP -LocalPort 6566 -Action Block

Related ports

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All port numbers · Open port checker
Assignment data: IANA port number registry (public domain), retrieved 2026-11-10.