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Port 3489 (dtp-dia)

IANA assigns port 3489 to dtp-dia: DTP/DIA.

Registered (user) port, 1024-49151 TCPUDP

IANA assignment

Service nameProtoDescriptionAssigneeReference
dtp-dia TCP DTP/DIA Alexei V Soloviev -
dtp-dia UDP DTP/DIA Alexei V Soloviev -

Registry dates for this port: registered 2002-05.

Check what is listening on port 3489

Linux: is anything listening on TCP 3489?
sudo ss -tlnp 'sport = :3489'
Linux: UDP 3489
sudo ss -ulnp 'sport = :3489'
Linux / macOS: which process owns the port
sudo lsof -nP -i :3489
Older Linux / BSD (net-tools)
sudo netstat -tlnp | grep ':3489 '
Windows (Command Prompt)
netstat -ano | findstr :3489
Windows (PowerShell)
Get-NetTCPConnection -LocalPort 3489 -State Listen | Select LocalAddress,OwningProcess

Test it from outside

From another machine
nc -vz -w 5 HOST 3489
From Windows
Test-NetConnection HOST -Port 3489
UDP probe (no reply does not prove it is closed)
nc -vzu -w 5 HOST 3489

Block port 3489 in the firewall

ufw
sudo ufw deny 3489/tcp
iptables
sudo iptables -A INPUT -p tcp --dport 3489 -j DROP
nftables
sudo nft add rule inet filter input tcp dport 3489 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block TCP 3489' -Direction Inbound -Protocol TCP -LocalPort 3489 -Action Block
ufw
sudo ufw deny 3489/udp
iptables
sudo iptables -A INPUT -p udp --dport 3489 -j DROP
nftables
sudo nft add rule inet filter input udp dport 3489 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block UDP 3489' -Direction Inbound -Protocol UDP -LocalPort 3489 -Action Block

Related ports

3487ltctcp, ltcudp3488fs-rh-srv3490colubris3491swr-port

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