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Port 3439 (hri-port)

IANA assigns port 3439 to hri-port: HRI Interface Port.

Registered (user) port, 1024-49151 TCPUDP

IANA assignment

Service nameProtoDescriptionAssigneeReference
hri-port TCP HRI Interface Port John Fayos -
hri-port UDP HRI Interface Port John Fayos -

Registry dates for this port: registered 2002-03.

Check what is listening on port 3439

Linux: is anything listening on TCP 3439?
sudo ss -tlnp 'sport = :3439'
Linux: UDP 3439
sudo ss -ulnp 'sport = :3439'
Linux / macOS: which process owns the port
sudo lsof -nP -i :3439
Older Linux / BSD (net-tools)
sudo netstat -tlnp | grep ':3439 '
Windows (Command Prompt)
netstat -ano | findstr :3439
Windows (PowerShell)
Get-NetTCPConnection -LocalPort 3439 -State Listen | Select LocalAddress,OwningProcess

Test it from outside

From another machine
nc -vz -w 5 HOST 3439
From Windows
Test-NetConnection HOST -Port 3439
UDP probe (no reply does not prove it is closed)
nc -vzu -w 5 HOST 3439

Block port 3439 in the firewall

ufw
sudo ufw deny 3439/tcp
iptables
sudo iptables -A INPUT -p tcp --dport 3439 -j DROP
nftables
sudo nft add rule inet filter input tcp dport 3439 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block TCP 3439' -Direction Inbound -Protocol TCP -LocalPort 3439 -Action Block
ufw
sudo ufw deny 3439/udp
iptables
sudo iptables -A INPUT -p udp --dport 3439 -j DROP
nftables
sudo nft add rule inet filter input udp dport 3439 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block UDP 3439' -Direction Inbound -Protocol UDP -LocalPort 3439 -Action Block

Related ports

3437autocueds3438spiral-admin3440ans-console3441connect-client

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