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// Other services

Port 4069: Minger Email Address Validation Service

Port 4069 is assigned by IANA to minger (Minger Email Address Validation Service).

4069

How minger works

Other services
client:4069mingerresponse client:4069mingerresponse

The client sends a request to port 4069 and the minger 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 4069 dangerous?

We have no specific security note for port 4069. 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 4069

ServicePortTransportDescriptionReferenceUpdated
minger 4069 TCP, UDP Minger Email Address Validation Service - 2007-03

// source: IANA service name and port number registry

03 Check it

Which program uses port 4069, and is it reachable?

Linux

sudo ss -ltnup 'sport = :4069'      # process listening on 4069
sudo lsof -nP -i :4069

macOS

sudo lsof -nP -i :4069

Windows (PowerShell)

Get-NetTCPConnection -LocalPort 4069 -State Listen | Select LocalAddress, OwningProcess
Get-NetUDPEndpoint -LocalPort 4069
netstat -ano | findstr :4069

From another machine

nmap -p 4069 -sV <host>
sudo nmap -sU -p 4069 <host>
nc -zv <host> 4069

Block it in the firewall

sudo ufw deny 4069/tcp                                         # Linux (ufw)
New-NetFirewallRule -DisplayName "Block 4069" -Direction Inbound -LocalPort 4069 -Protocol TCP -Action Block  # Windows
04 FAQ
What is port 4069 used for?

Port 4069 is assigned by IANA to minger (Minger Email Address Validation Service).

Is port 4069 TCP or UDP?

Port 4069 is registered for TCP and UDP.

Is it safe to open port 4069?

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 4069 is open?

On Linux run "ss -ltnup 'sport = :4069'", on macOS "lsof -nP -i :4069", and on Windows "netstat -ano | findstr :4069" to see the local process. From another machine, "nmap -p 4069 <host>" shows whether it is reachable.

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