Port 9387 (d2dconfig)

IANA assigns port 9387 to d2dconfig: D2D Configuration Service.

Registered (user) port, 1024-49151 TCP

IANA assignment

Service nameProtoDescriptionAssigneeReference

d2dconfig TCP D2D Configuration Service Pete Camble -

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

Linux: is anything listening on TCP 9387?

sudo ss -tlnp 'sport = :9387'

Linux / macOS: which process owns the port

sudo lsof -nP -i :9387

Older Linux / BSD (net-tools)

sudo netstat -tlnp | grep ':9387 '

Windows (Command Prompt)

netstat -ano | findstr :9387

Windows (PowerShell)

Get-NetTCPConnection -LocalPort 9387 -State Listen | Select LocalAddress,OwningProcess

From another machine

nc -vz -w 5 HOST 9387

From Windows

Test-NetConnection HOST -Port 9387

ufw

sudo ufw deny 9387/tcp

iptables

sudo iptables -A INPUT -p tcp --dport 9387 -j DROP

nftables

sudo nft add rule inet filter input tcp dport 9387 drop

Windows Firewall

New-NetFirewallRule -DisplayName 'Block TCP 9387' -Direction Inbound -Protocol TCP -LocalPort 9387 -Action Block

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