CyberHunter
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// Other services

Port 471: Mondex

Port 471 is assigned by IANA to mondex (Mondex).

471

How mondex works

Other services
client:471mondexresponse client:471mondexresponse

The client sends a request to port 471 and the mondex 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
Well-known (0-1023)
Category
Other services
01 Security

Is port 471 dangerous?

We have no specific security note for port 471. 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 471

ServicePortTransportDescriptionReferenceUpdated
mondex 471 TCP, UDP Mondex - -

// source: IANA service name and port number registry

03 Check it

Which program uses port 471, and is it reachable?

Linux

sudo ss -ltnup 'sport = :471'      # process listening on 471
sudo lsof -nP -i :471

macOS

sudo lsof -nP -i :471

Windows (PowerShell)

Get-NetTCPConnection -LocalPort 471 -State Listen | Select LocalAddress, OwningProcess
Get-NetUDPEndpoint -LocalPort 471
netstat -ano | findstr :471

From another machine

nmap -p 471 -sV <host>
sudo nmap -sU -p 471 <host>
nc -zv <host> 471

Block it in the firewall

sudo ufw deny 471/tcp                                         # Linux (ufw)
New-NetFirewallRule -DisplayName "Block 471" -Direction Inbound -LocalPort 471 -Protocol TCP -Action Block  # Windows
04 FAQ
What is port 471 used for?

Port 471 is assigned by IANA to mondex (Mondex).

Is port 471 TCP or UDP?

Port 471 is registered for TCP and UDP.

Is it safe to open port 471?

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 471 is open?

On Linux run "ss -ltnup 'sport = :471'", on macOS "lsof -nP -i :471", and on Windows "netstat -ano | findstr :471" to see the local process. From another machine, "nmap -p 471 <host>" shows whether it is reachable.

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