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// Other services

Port 665: Sun DR

Port 665 is assigned by IANA to sun-dr (Sun DR).

665

How sun-dr works

Other services
client:665sun-drresponse client:665sun-drresponse

The client sends a request to port 665 and the sun-dr 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
Well-known (0-1023)
Category
Other services
01 Security

Is port 665 dangerous?

We have no specific security note for port 665. 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 665

ServicePortTransportDescriptionReferenceUpdated
sun-dr 665 TCP, UDP Sun DR - -

// source: IANA service name and port number registry

03 Check it

Which program uses port 665, and is it reachable?

Linux

sudo ss -ltnup 'sport = :665'      # process listening on 665
sudo lsof -nP -i :665

macOS

sudo lsof -nP -i :665

Windows (PowerShell)

Get-NetTCPConnection -LocalPort 665 -State Listen | Select LocalAddress, OwningProcess
Get-NetUDPEndpoint -LocalPort 665
netstat -ano | findstr :665

From another machine

nmap -p 665 -sV <host>
sudo nmap -sU -p 665 <host>
nc -zv <host> 665

Block it in the firewall

sudo ufw deny 665/tcp                                         # Linux (ufw)
New-NetFirewallRule -DisplayName "Block 665" -Direction Inbound -LocalPort 665 -Protocol TCP -Action Block  # Windows
04 FAQ
What is port 665 used for?

Port 665 is assigned by IANA to sun-dr (Sun DR).

Is port 665 TCP or UDP?

Port 665 is registered for TCP and UDP.

Is it safe to open port 665?

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 665 is open?

On Linux run "ss -ltnup 'sport = :665'", on macOS "lsof -nP -i :665", and on Windows "netstat -ano | findstr :665" to see the local process. From another machine, "nmap -p 665 <host>" shows whether it is reachable.

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