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// Other services

Port 2065: Data Link Switch Read Port Number

Port 2065 is assigned by IANA to dlsrpn (Data Link Switch Read Port Number).

2065

How dlsrpn works

Other services
client:2065dlsrpnresponse client:2065dlsrpnresponse

The client sends a request to port 2065 and the dlsrpn 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 2065 dangerous?

We have no specific security note for port 2065. 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 2065

ServicePortTransportDescriptionReferenceUpdated
dlsrpn 2065 TCP, UDP Data Link Switch Read Port Number - -

// source: IANA service name and port number registry

03 Check it

Which program uses port 2065, and is it reachable?

Linux

sudo ss -ltnup 'sport = :2065'      # process listening on 2065
sudo lsof -nP -i :2065

macOS

sudo lsof -nP -i :2065

Windows (PowerShell)

Get-NetTCPConnection -LocalPort 2065 -State Listen | Select LocalAddress, OwningProcess
Get-NetUDPEndpoint -LocalPort 2065
netstat -ano | findstr :2065

From another machine

nmap -p 2065 -sV <host>
sudo nmap -sU -p 2065 <host>
nc -zv <host> 2065

Block it in the firewall

sudo ufw deny 2065/tcp                                         # Linux (ufw)
New-NetFirewallRule -DisplayName "Block 2065" -Direction Inbound -LocalPort 2065 -Protocol TCP -Action Block  # Windows
04 FAQ
What is port 2065 used for?

Port 2065 is assigned by IANA to dlsrpn (Data Link Switch Read Port Number).

Is port 2065 TCP or UDP?

Port 2065 is registered for TCP and UDP.

Is it safe to open port 2065?

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 2065 is open?

On Linux run "ss -ltnup 'sport = :2065'", on macOS "lsof -nP -i :2065", and on Windows "netstat -ano | findstr :2065" to see the local process. From another machine, "nmap -p 2065 <host>" shows whether it is reachable.

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