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// Other services

Port 6420: NIM_VDRShell

Port 6420 is assigned by IANA to nim-vdrshell (NIM_VDRShell).

6420

How nim-vdrshell works

Other services
client:6420nim-vdrshellresponse client:6420nim-vdrshellresponse

The client sends a request to port 6420 and the nim-vdrshell 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 6420 dangerous?

We have no specific security note for port 6420. 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 6420

ServicePortTransportDescriptionReferenceUpdated
nim-vdrshell 6420 TCP, UDP NIM_VDRShell - 2006-02

// source: IANA service name and port number registry

03 Check it

Which program uses port 6420, and is it reachable?

Linux

sudo ss -ltnup 'sport = :6420'      # process listening on 6420
sudo lsof -nP -i :6420

macOS

sudo lsof -nP -i :6420

Windows (PowerShell)

Get-NetTCPConnection -LocalPort 6420 -State Listen | Select LocalAddress, OwningProcess
Get-NetUDPEndpoint -LocalPort 6420
netstat -ano | findstr :6420

From another machine

nmap -p 6420 -sV <host>
sudo nmap -sU -p 6420 <host>
nc -zv <host> 6420

Block it in the firewall

sudo ufw deny 6420/tcp                                         # Linux (ufw)
New-NetFirewallRule -DisplayName "Block 6420" -Direction Inbound -LocalPort 6420 -Protocol TCP -Action Block  # Windows
04 FAQ
What is port 6420 used for?

Port 6420 is assigned by IANA to nim-vdrshell (NIM_VDRShell).

Is port 6420 TCP or UDP?

Port 6420 is registered for TCP and UDP.

Is it safe to open port 6420?

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 6420 is open?

On Linux run "ss -ltnup 'sport = :6420'", on macOS "lsof -nP -i :6420", and on Windows "netstat -ano | findstr :6420" to see the local process. From another machine, "nmap -p 6420 <host>" shows whether it is reachable.

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