CyberHunter
Local dataset, no network
// Other services

Port 1780: dpkeyserv

Port 1780 is assigned by IANA to dpkeyserv (dpkeyserv).

1780

How dpkeyserv works

Other services
client:1780dpkeyservresponse client:1780dpkeyservresponse

The client sends a request to port 1780 and the dpkeyserv 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 1780 dangerous?

We have no specific security note for port 1780. 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 1780

ServicePortTransportDescriptionReferenceUpdated
dpkeyserv 1780 TCP, UDP dpkeyserv - -

// source: IANA service name and port number registry

03 Check it

Which program uses port 1780, and is it reachable?

Linux

sudo ss -ltnup 'sport = :1780'      # process listening on 1780
sudo lsof -nP -i :1780

macOS

sudo lsof -nP -i :1780

Windows (PowerShell)

Get-NetTCPConnection -LocalPort 1780 -State Listen | Select LocalAddress, OwningProcess
Get-NetUDPEndpoint -LocalPort 1780
netstat -ano | findstr :1780

From another machine

nmap -p 1780 -sV <host>
sudo nmap -sU -p 1780 <host>
nc -zv <host> 1780

Block it in the firewall

sudo ufw deny 1780/tcp                                         # Linux (ufw)
New-NetFirewallRule -DisplayName "Block 1780" -Direction Inbound -LocalPort 1780 -Protocol TCP -Action Block  # Windows
04 FAQ
What is port 1780 used for?

Port 1780 is assigned by IANA to dpkeyserv (dpkeyserv).

Is port 1780 TCP or UDP?

Port 1780 is registered for TCP and UDP.

Is it safe to open port 1780?

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 1780 is open?

On Linux run "ss -ltnup 'sport = :1780'", on macOS "lsof -nP -i :1780", and on Windows "netstat -ano | findstr :1780" to see the local process. From another machine, "nmap -p 1780 <host>" shows whether it is reachable.

05 Related
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