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// Other services

Port 4411: Found Messaging Protocol

Port 4411 is assigned by IANA to found (Found Messaging Protocol).

4411

How found works

Other services
client:4411foundresponse client:4411foundresponse

The client sends a request to port 4411 and the found service answers.

Transport
TCP
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 4411 dangerous?

We have no specific security note for port 4411. 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 4411

ServicePortTransportDescriptionReferenceUpdated
found 4411 TCP Found Messaging Protocol - 2012-04-11
-4411-Reserved--

// source: IANA service name and port number registry

03 Check it

Which program uses port 4411, and is it reachable?

Linux

sudo ss -ltnup 'sport = :4411'      # process listening on 4411
sudo lsof -nP -i :4411

macOS

sudo lsof -nP -i :4411

Windows (PowerShell)

Get-NetTCPConnection -LocalPort 4411 -State Listen | Select LocalAddress, OwningProcess
Get-NetUDPEndpoint -LocalPort 4411
netstat -ano | findstr :4411

From another machine

nmap -p 4411 -sV <host>
nc -zv <host> 4411

Block it in the firewall

sudo ufw deny 4411/tcp                                         # Linux (ufw)
New-NetFirewallRule -DisplayName "Block 4411" -Direction Inbound -LocalPort 4411 -Protocol TCP -Action Block  # Windows
04 FAQ
What is port 4411 used for?

Port 4411 is assigned by IANA to found (Found Messaging Protocol).

Is port 4411 TCP or UDP?

Port 4411 is registered for TCP.

Is it safe to open port 4411?

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 4411 is open?

On Linux run "ss -ltnup 'sport = :4411'", on macOS "lsof -nP -i :4411", and on Windows "netstat -ano | findstr :4411" to see the local process. From another machine, "nmap -p 4411 <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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