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// Other services

Port 2067: Data Link Switch Write Port Number

Port 2067 is assigned by IANA to dlswpn (Data Link Switch Write Port Number).

2067

How dlswpn works

Other services
client:2067dlswpnresponse client:2067dlswpnresponse

The client sends a request to port 2067 and the dlswpn 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 2067 dangerous?

We have no specific security note for port 2067. 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 2067

ServicePortTransportDescriptionReferenceUpdated
dlswpn 2067 TCP, UDP Data Link Switch Write Port Number - -

// source: IANA service name and port number registry

03 Check it

Which program uses port 2067, and is it reachable?

Linux

sudo ss -ltnup 'sport = :2067'      # process listening on 2067
sudo lsof -nP -i :2067

macOS

sudo lsof -nP -i :2067

Windows (PowerShell)

Get-NetTCPConnection -LocalPort 2067 -State Listen | Select LocalAddress, OwningProcess
Get-NetUDPEndpoint -LocalPort 2067
netstat -ano | findstr :2067

From another machine

nmap -p 2067 -sV <host>
sudo nmap -sU -p 2067 <host>
nc -zv <host> 2067

Block it in the firewall

sudo ufw deny 2067/tcp                                         # Linux (ufw)
New-NetFirewallRule -DisplayName "Block 2067" -Direction Inbound -LocalPort 2067 -Protocol TCP -Action Block  # Windows
04 FAQ
What is port 2067 used for?

Port 2067 is assigned by IANA to dlswpn (Data Link Switch Write Port Number).

Is port 2067 TCP or UDP?

Port 2067 is registered for TCP and UDP.

Is it safe to open port 2067?

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 2067 is open?

On Linux run "ss -ltnup 'sport = :2067'", on macOS "lsof -nP -i :2067", and on Windows "netstat -ano | findstr :2067" to see the local process. From another machine, "nmap -p 2067 <host>" shows whether it is reachable.

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