- 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.
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 servicesThe 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
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:
IANA registry entries for port 4200
| Service | Port | Transport | Description | Reference | Updated |
|---|---|---|---|---|---|
| vrml-multi-use | 4200-4299 | - | VRML Multi User Systems | - | - |
// source: IANA service name and port number registry
Which program uses port 4200, and is it reachable?
Linux
sudo ss -ltnup 'sport = :4200' # process listening on 4200
sudo lsof -nP -i :4200macOS
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
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.
Other other services ports
: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