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Port 1565 (winddlb)

IANA assigns port 1565 to winddlb: WinDD.

Registered (user) port, 1024-49151 TCPUDP

IANA assignment

Service nameProtoDescriptionAssigneeReference
winddlb TCP WinDD Kelly Sims -
winddlb UDP WinDD Kelly Sims -

Check what is listening on port 1565

Linux: is anything listening on TCP 1565?
sudo ss -tlnp 'sport = :1565'
Linux: UDP 1565
sudo ss -ulnp 'sport = :1565'
Linux / macOS: which process owns the port
sudo lsof -nP -i :1565
Older Linux / BSD (net-tools)
sudo netstat -tlnp | grep ':1565 '
Windows (Command Prompt)
netstat -ano | findstr :1565
Windows (PowerShell)
Get-NetTCPConnection -LocalPort 1565 -State Listen | Select LocalAddress,OwningProcess

Test it from outside

From another machine
nc -vz -w 5 HOST 1565
From Windows
Test-NetConnection HOST -Port 1565
UDP probe (no reply does not prove it is closed)
nc -vzu -w 5 HOST 1565

Block port 1565 in the firewall

ufw
sudo ufw deny 1565/tcp
iptables
sudo iptables -A INPUT -p tcp --dport 1565 -j DROP
nftables
sudo nft add rule inet filter input tcp dport 1565 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block TCP 1565' -Direction Inbound -Protocol TCP -LocalPort 1565 -Action Block
ufw
sudo ufw deny 1565/udp
iptables
sudo iptables -A INPUT -p udp --dport 1565 -j DROP
nftables
sudo nft add rule inet filter input udp dport 1565 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block UDP 1565' -Direction Inbound -Protocol UDP -LocalPort 1565 -Action Block

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