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Port 4069 (minger)

IANA assigns port 4069 to minger: Minger Email Address Validation Service.

Registered (user) port, 1024-49151 TCPUDP

IANA assignment

Service nameProtoDescriptionAssigneeReference
minger TCP Minger Email Address Validation Service Arvel Hathcock -
minger UDP Minger Email Address Validation Service Arvel Hathcock -

Registry dates for this port: registered 2007-03.

Check what is listening on port 4069

Linux: is anything listening on TCP 4069?
sudo ss -tlnp 'sport = :4069'
Linux: UDP 4069
sudo ss -ulnp 'sport = :4069'
Linux / macOS: which process owns the port
sudo lsof -nP -i :4069
Older Linux / BSD (net-tools)
sudo netstat -tlnp | grep ':4069 '
Windows (Command Prompt)
netstat -ano | findstr :4069
Windows (PowerShell)
Get-NetTCPConnection -LocalPort 4069 -State Listen | Select LocalAddress,OwningProcess

Test it from outside

From another machine
nc -vz -w 5 HOST 4069
From Windows
Test-NetConnection HOST -Port 4069
UDP probe (no reply does not prove it is closed)
nc -vzu -w 5 HOST 4069

Block port 4069 in the firewall

ufw
sudo ufw deny 4069/tcp
iptables
sudo iptables -A INPUT -p tcp --dport 4069 -j DROP
nftables
sudo nft add rule inet filter input tcp dport 4069 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block TCP 4069' -Direction Inbound -Protocol TCP -LocalPort 4069 -Action Block
ufw
sudo ufw deny 4069/udp
iptables
sudo iptables -A INPUT -p udp --dport 4069 -j DROP
nftables
sudo nft add rule inet filter input udp dport 4069 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block UDP 4069' -Direction Inbound -Protocol UDP -LocalPort 4069 -Action Block

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Assignment data: IANA port number registry (public domain), retrieved 2026-11-10.