Port 9388 (d2ddatatrans)

IANA assigns port 9388 to d2ddatatrans: D2D Data Transfer Service.

Registered (user) port, 1024-49151 TCP

IANA assignment

Service nameProtoDescriptionAssigneeReference

d2ddatatrans TCP D2D Data Transfer Service Pete Camble -

Registry dates for this port: registered 2008-12-24.

Linux: is anything listening on TCP 9388?

sudo ss -tlnp 'sport = :9388'

Linux / macOS: which process owns the port

sudo lsof -nP -i :9388

Older Linux / BSD (net-tools)

sudo netstat -tlnp | grep ':9388 '

Windows (Command Prompt)

netstat -ano | findstr :9388

Windows (PowerShell)

Get-NetTCPConnection -LocalPort 9388 -State Listen | Select LocalAddress,OwningProcess

From another machine

nc -vz -w 5 HOST 9388

From Windows

Test-NetConnection HOST -Port 9388

ufw

sudo ufw deny 9388/tcp

iptables

sudo iptables -A INPUT -p tcp --dport 9388 -j DROP

nftables

sudo nft add rule inet filter input tcp dport 9388 drop

Windows Firewall

New-NetFirewallRule -DisplayName 'Block TCP 9388' -Direction Inbound -Protocol TCP -LocalPort 9388 -Action Block

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Assignment data: IANA port number registry (public domain), retrieved 2026-11-10.