Port 6420NIM_VDRShell

An obscure TCP/UDP assignment with no established public protocol or commonly observed listener.

transport: tcp · udp
in transit: cleartext
assignment: official
risk: 1/10
lookups: 0

Technical Details

what runs on :6420

NIM_VDRShell is registered on port :6420 over tcp and udp to Rik Ditter, assigned February 2006. We don't have a technical write-up for it beyond the IANA registry entry.

In nmap's internet-wide scan data this port is never observed open, so if it's open on your network it's more likely a custom or misconfigured service than the registered one.

find what's listening on :6420

this machine

# linux
sudo ss -tulpn 'sport = :6420'

# macos / bsd
sudo lsof -nP -i :6420

# windows (then: tasklist /FI "PID eq <pid>")
netstat -ano | findstr :6420

another host

nmap -sV -p T:6420 <host>
sudo nmap -sU -sV -p U:6420 <host>

run it? the handshake, the implementations you meet in the wild and the flags that matter come from the engineers who do.

add technical details

Security Information

exposure of :6420

risk score

1/ 10safe

routine exposure. this port is rarely the way in on its own — keep it patched and logged and move on.

in transit

cleartext

credentials and payloads are readable by anyone on path

assignment

official

registered with iana for this service — scanners fingerprint it by number

reachable over

tcp · udp

udp is connectionless — source addresses are trivially spoofed and it is a reflection favourite

security overview

no security notes recorded for :6420 yet

known exploits, hardening advice, what a compromise looks like — suggest an edit if you know its exposure.

Record

iana registry entry

port: :6420
service: NIM_VDRShell
transport: TCPUDP
encryption: cleartext
assignment: iana registered
risk: 1/10safe
category: uncategorised
usage: NIM_VDRShell is an IANA assignment on TCP and UDP registered to Rik Ditter in 2006. No established public protocol or commonly deployed listener is known, and it has not appeared open in Nmap's internet-wide scan data.
lookups: 0rank 993
added: 2026-10-10
updated: 2026-10-10
references: IANA service name registry — port 6420

Something wrong?

This record is maintained by the engineers who use port 6420. Every field on it is editable — change what's wrong, say how you know, and a reviewer publishes it, usually within a minute. Last touched 2026-10-10.

01edit any field on a page of its own
02a model checks it for accuracy and spam
03clean and confident goes live immediately

edit this record →back to the registry

Related Ports

browse categories →

ports registered around :6420, by lookups.

port	service	proto	category	risk	views
:6444	SGE Qmaster	TCPUDP	Network Services	caution	8.8k
:6432	PgBouncer	TCP	Databases	caution	8.7k
:6445	Sun Grid Engine Exec	TCPUDP	System	caution	8.1k
:6389	EMC CLARiiON	TCP	Databases	caution	4.9k
:6406	Business Objects Enterprise internal server		System	safe	0
:6481	Service Tags	TCPUDP	—	safe	0
:6379	Redis	TCP	Databases	critical	0
:6405	SAP BusinessObjects Enterprise internal server		System	safe	0

risk mix of the 8 listed

safe38%
caution50%
critical13%

0 of 8 encrypted

Port :6420NIM_VDRShell

Technical Details

Security Information

Related Ports

Port 6420NIM_VDRShell