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Port 3247 (dvt-data)

IANA assigns port 3247 to dvt-data: DVT DATA LINK.

Registered (user) port, 1024-49151 TCPUDP

IANA assignment

Service nameProtoDescriptionAssigneeReference
dvt-data TCP DVT DATA LINK Phillip Heil -
dvt-data UDP DVT DATA LINK Phillip Heil -

Registry dates for this port: registered 2002-02.

Check what is listening on port 3247

Linux: is anything listening on TCP 3247?
sudo ss -tlnp 'sport = :3247'
Linux: UDP 3247
sudo ss -ulnp 'sport = :3247'
Linux / macOS: which process owns the port
sudo lsof -nP -i :3247
Older Linux / BSD (net-tools)
sudo netstat -tlnp | grep ':3247 '
Windows (Command Prompt)
netstat -ano | findstr :3247
Windows (PowerShell)
Get-NetTCPConnection -LocalPort 3247 -State Listen | Select LocalAddress,OwningProcess

Test it from outside

From another machine
nc -vz -w 5 HOST 3247
From Windows
Test-NetConnection HOST -Port 3247
UDP probe (no reply does not prove it is closed)
nc -vzu -w 5 HOST 3247

Block port 3247 in the firewall

ufw
sudo ufw deny 3247/tcp
iptables
sudo iptables -A INPUT -p tcp --dport 3247 -j DROP
nftables
sudo nft add rule inet filter input tcp dport 3247 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block TCP 3247' -Direction Inbound -Protocol TCP -LocalPort 3247 -Action Block
ufw
sudo ufw deny 3247/udp
iptables
sudo iptables -A INPUT -p udp --dport 3247 -j DROP
nftables
sudo nft add rule inet filter input udp dport 3247 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block UDP 3247' -Direction Inbound -Protocol UDP -LocalPort 3247 -Action Block

Related ports

3245vieo-fe3246dvt-system3248procos-lm3249ssp

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