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Port 4302 (d-data-control)

IANA assigns port 4302 to d-data-control: Diagnostic Data Control.

Registered (user) port, 1024-49151 TCPUDP

IANA assignment

Service nameProtoDescriptionAssigneeReference
d-data-control TCP Diagnostic Data Control Jon March -
d-data-control UDP Diagnostic Data Control Jon March -

Registry dates for this port: registered 2006-09.

Check what is listening on port 4302

Linux: is anything listening on TCP 4302?
sudo ss -tlnp 'sport = :4302'
Linux: UDP 4302
sudo ss -ulnp 'sport = :4302'
Linux / macOS: which process owns the port
sudo lsof -nP -i :4302
Older Linux / BSD (net-tools)
sudo netstat -tlnp | grep ':4302 '
Windows (Command Prompt)
netstat -ano | findstr :4302
Windows (PowerShell)
Get-NetTCPConnection -LocalPort 4302 -State Listen | Select LocalAddress,OwningProcess

Test it from outside

From another machine
nc -vz -w 5 HOST 4302
From Windows
Test-NetConnection HOST -Port 4302
UDP probe (no reply does not prove it is closed)
nc -vzu -w 5 HOST 4302

Block port 4302 in the firewall

ufw
sudo ufw deny 4302/tcp
iptables
sudo iptables -A INPUT -p tcp --dport 4302 -j DROP
nftables
sudo nft add rule inet filter input tcp dport 4302 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block TCP 4302' -Direction Inbound -Protocol TCP -LocalPort 4302 -Action Block
ufw
sudo ufw deny 4302/udp
iptables
sudo iptables -A INPUT -p udp --dport 4302 -j DROP
nftables
sudo nft add rule inet filter input udp dport 4302 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block UDP 4302' -Direction Inbound -Protocol UDP -LocalPort 4302 -Action Block

Related ports

4300corelccam4301d-data4303srcp4304owserver

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