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// Other services

Port 11111: Viral Computing Environment (VCE)

Port 11111 is assigned by IANA to vce (Viral Computing Environment (VCE)).

11111

How vce works

Other services
client:11111vceresponse client:11111vceresponse

The client sends a request to port 11111 and the vce 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 11111 dangerous?

We have no specific security note for port 11111. 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 11111

ServicePortTransportDescriptionReferenceUpdated
vce 11111 TCP, UDP Viral Computing Environment (VCE) - -

// source: IANA service name and port number registry

03 Check it

Which program uses port 11111, and is it reachable?

Linux

sudo ss -ltnup 'sport = :11111'      # process listening on 11111
sudo lsof -nP -i :11111

macOS

sudo lsof -nP -i :11111

Windows (PowerShell)

Get-NetTCPConnection -LocalPort 11111 -State Listen | Select LocalAddress, OwningProcess
Get-NetUDPEndpoint -LocalPort 11111
netstat -ano | findstr :11111

From another machine

nmap -p 11111 -sV <host>
sudo nmap -sU -p 11111 <host>
nc -zv <host> 11111

Block it in the firewall

sudo ufw deny 11111/tcp                                         # Linux (ufw)
New-NetFirewallRule -DisplayName "Block 11111" -Direction Inbound -LocalPort 11111 -Protocol TCP -Action Block  # Windows
04 FAQ
What is port 11111 used for?

Port 11111 is assigned by IANA to vce (Viral Computing Environment (VCE)).

Is port 11111 TCP or UDP?

Port 11111 is registered for TCP and UDP.

Is it safe to open port 11111?

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 11111 is open?

On Linux run "ss -ltnup 'sport = :11111'", on macOS "lsof -nP -i :11111", and on Windows "netstat -ano | findstr :11111" to see the local process. From another machine, "nmap -p 11111 <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

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