CyberHunter
LinkedIn profile - Bastien Cordier Email: contact@bastiencordier.pro
// Other services

Port 4200: VRML Multi User Systems

Port 4200 is assigned by IANA to vrml-multi-use (VRML Multi User Systems).

4200

How vrml-multi-use works

Other services
client:4200vrml-multi-useresponse client:4200vrml-multi-useresponse

The client sends a request to port 4200 and the vrml-multi-use service answers.

Transport
None registered
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 4200 dangerous?

We have no specific security note for port 4200. 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 4200

ServicePortTransportDescriptionReferenceUpdated
vrml-multi-use 4200-4299 - VRML Multi User Systems - -

// source: IANA service name and port number registry

03 Check it

Which program uses port 4200, and is it reachable?

Linux

sudo ss -ltnup 'sport = :4200'      # process listening on 4200
sudo lsof -nP -i :4200

macOS

sudo lsof -nP -i :4200

Windows (PowerShell)

Get-NetTCPConnection -LocalPort 4200 -State Listen | Select LocalAddress, OwningProcess
Get-NetUDPEndpoint -LocalPort 4200
netstat -ano | findstr :4200

From another machine

nmap -p 4200 -sV <host>
nc -zv <host> 4200

Block it in the firewall

sudo ufw deny 4200/tcp                                         # Linux (ufw)
New-NetFirewallRule -DisplayName "Block 4200" -Direction Inbound -LocalPort 4200 -Protocol TCP -Action Block  # Windows
04 FAQ
What is port 4200 used for?

Port 4200 is assigned by IANA to vrml-multi-use (VRML Multi User Systems).

Is port 4200 TCP or UDP?

Port 4200 has no registered transport. Any program can still use it over TCP or UDP.

Is it safe to open port 4200?

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 4200 is open?

On Linux run "ss -ltnup 'sport = :4200'", on macOS "lsof -nP -i :4200", and on Windows "netstat -ano | findstr :4200" to see the local process. From another machine, "nmap -p 4200 <host>" shows whether it is reachable.

05 Related
:4444 Metasploit default / krb524 tcp · udp · high risk :31337 Back Orifice / elite tcp · udp · high risk :1 TCP Port Service Multiplexer tcp · udp :5 Remote Job Entry tcp · udp :9 Discard tcp · udp · sctp · dccp :11 Active Users tcp · udp :17 Quote of the Day tcp · udp :18 Message Send Protocol (historic) tcp · udp

Latest vulnerability news

All news