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Port 3206 (ironmail)

IANA assigns port 3206 to ironmail: IronMail POP Proxy.

Registered (user) port, 1024-49151 TCPUDP

IANA assignment

Service nameProtoDescriptionAssigneeReference
ironmail TCP IronMail POP Proxy Mike Hudack -
ironmail UDP IronMail POP Proxy Mike Hudack -

Check what is listening on port 3206

Linux: is anything listening on TCP 3206?
sudo ss -tlnp 'sport = :3206'
Linux: UDP 3206
sudo ss -ulnp 'sport = :3206'
Linux / macOS: which process owns the port
sudo lsof -nP -i :3206
Older Linux / BSD (net-tools)
sudo netstat -tlnp | grep ':3206 '
Windows (Command Prompt)
netstat -ano | findstr :3206
Windows (PowerShell)
Get-NetTCPConnection -LocalPort 3206 -State Listen | Select LocalAddress,OwningProcess

Test it from outside

From another machine
nc -vz -w 5 HOST 3206
From Windows
Test-NetConnection HOST -Port 3206
UDP probe (no reply does not prove it is closed)
nc -vzu -w 5 HOST 3206

Block port 3206 in the firewall

ufw
sudo ufw deny 3206/tcp
iptables
sudo iptables -A INPUT -p tcp --dport 3206 -j DROP
nftables
sudo nft add rule inet filter input tcp dport 3206 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block TCP 3206' -Direction Inbound -Protocol TCP -LocalPort 3206 -Action Block
ufw
sudo ufw deny 3206/udp
iptables
sudo iptables -A INPUT -p udp --dport 3206 -j DROP
nftables
sudo nft add rule inet filter input udp dport 3206 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block UDP 3206' -Direction Inbound -Protocol UDP -LocalPort 3206 -Action Block

Related ports

3204netwatcher-db3205isns3207vx-auth-port3208pfu-prcallback

All port numbers · Open port checker
Assignment data: IANA port number registry (public domain), retrieved 2026-11-10.