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// Other services

Port 625: DEC DLM

Port 625 is assigned by IANA to dec_dlm (DEC DLM), dec-dlm (DEC DLM IANA assigned this well-formed service name as a replacement for "dec_dlm".).

625

How dec_dlm works

Other services
client:625dec_dlmresponse client:625dec_dlmresponse

The client sends a request to port 625 and the dec_dlm service answers.

Transport
TCP · UDP
Exposure risk
not rated depends on the program listening
Encryption
Unknownnot stated by the registry
IANA status
Assigned2 registered services
Range
Well-known (0-1023)
Category
Other services
01 Security

Is port 625 dangerous?

We have no specific security note for port 625. 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 625

ServicePortTransportDescriptionReferenceUpdated
dec_dlm 625 TCP, UDP DEC DLM - -
dec-dlm 625 TCP, UDP DEC DLM IANA assigned this well-formed service name as a replacement for "dec_dlm". - -

// source: IANA service name and port number registry

03 Check it

Which program uses port 625, and is it reachable?

Linux

sudo ss -ltnup 'sport = :625'      # process listening on 625
sudo lsof -nP -i :625

macOS

sudo lsof -nP -i :625

Windows (PowerShell)

Get-NetTCPConnection -LocalPort 625 -State Listen | Select LocalAddress, OwningProcess
Get-NetUDPEndpoint -LocalPort 625
netstat -ano | findstr :625

From another machine

nmap -p 625 -sV <host>
sudo nmap -sU -p 625 <host>
nc -zv <host> 625

Block it in the firewall

sudo ufw deny 625/tcp                                         # Linux (ufw)
New-NetFirewallRule -DisplayName "Block 625" -Direction Inbound -LocalPort 625 -Protocol TCP -Action Block  # Windows
04 FAQ
What is port 625 used for?

Port 625 is assigned by IANA to dec_dlm (DEC DLM), dec-dlm (DEC DLM IANA assigned this well-formed service name as a replacement for "dec_dlm".).

Is port 625 TCP or UDP?

Port 625 is registered for TCP and UDP.

Is it safe to open port 625?

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 625 is open?

On Linux run "ss -ltnup 'sport = :625'", on macOS "lsof -nP -i :625", and on Windows "netstat -ano | findstr :625" to see the local process. From another machine, "nmap -p 625 <host>" shows whether it is reachable.

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