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Port 747 (fujitsu-dev)

IANA assigns port 747 to fujitsu-dev: Fujitsu Device Control.

Well-known (system) port, 0-1023 TCPUDP

IANA assignment

Service nameProtoDescriptionAssigneeReference
fujitsu-dev TCP Fujitsu Device Control - -
fujitsu-dev UDP Fujitsu Device Control - -

Check what is listening on port 747

Linux: is anything listening on TCP 747?
sudo ss -tlnp 'sport = :747'
Linux: UDP 747
sudo ss -ulnp 'sport = :747'
Linux / macOS: which process owns the port
sudo lsof -nP -i :747
Older Linux / BSD (net-tools)
sudo netstat -tlnp | grep ':747 '
Windows (Command Prompt)
netstat -ano | findstr :747
Windows (PowerShell)
Get-NetTCPConnection -LocalPort 747 -State Listen | Select LocalAddress,OwningProcess

Test it from outside

From another machine
nc -vz -w 5 HOST 747
From Windows
Test-NetConnection HOST -Port 747
UDP probe (no reply does not prove it is closed)
nc -vzu -w 5 HOST 747

Block port 747 in the firewall

ufw
sudo ufw deny 747/tcp
iptables
sudo iptables -A INPUT -p tcp --dport 747 -j DROP
nftables
sudo nft add rule inet filter input tcp dport 747 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block TCP 747' -Direction Inbound -Protocol TCP -LocalPort 747 -Action Block
ufw
sudo ufw deny 747/udp
iptables
sudo iptables -A INPUT -p udp --dport 747 -j DROP
nftables
sudo nft add rule inet filter input udp dport 747 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block UDP 747' -Direction Inbound -Protocol UDP -LocalPort 747 -Action Block

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