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// Other services

Port 1565: WinDD

Port 1565 is assigned by IANA to winddlb (WinDD).

1565

How winddlb works

Other services
client:1565winddlbresponse client:1565winddlbresponse

The client sends a request to port 1565 and the winddlb 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 1565 dangerous?

We have no specific security note for port 1565. 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 1565

ServicePortTransportDescriptionReferenceUpdated
winddlb 1565 TCP, UDP WinDD - -

// source: IANA service name and port number registry

03 Check it

Which program uses port 1565, and is it reachable?

Linux

sudo ss -ltnup 'sport = :1565'      # process listening on 1565
sudo lsof -nP -i :1565

macOS

sudo lsof -nP -i :1565

Windows (PowerShell)

Get-NetTCPConnection -LocalPort 1565 -State Listen | Select LocalAddress, OwningProcess
Get-NetUDPEndpoint -LocalPort 1565
netstat -ano | findstr :1565

From another machine

nmap -p 1565 -sV <host>
sudo nmap -sU -p 1565 <host>
nc -zv <host> 1565

Block it in the firewall

sudo ufw deny 1565/tcp                                         # Linux (ufw)
New-NetFirewallRule -DisplayName "Block 1565" -Direction Inbound -LocalPort 1565 -Protocol TCP -Action Block  # Windows
04 FAQ
What is port 1565 used for?

Port 1565 is assigned by IANA to winddlb (WinDD).

Is port 1565 TCP or UDP?

Port 1565 is registered for TCP and UDP.

Is it safe to open port 1565?

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 1565 is open?

On Linux run "ss -ltnup 'sport = :1565'", on macOS "lsof -nP -i :1565", and on Windows "netstat -ano | findstr :1565" to see the local process. From another machine, "nmap -p 1565 <host>" shows whether it is reachable.

05 Related
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