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Port 3147 (rfio)

IANA assigns port 3147 to rfio: RFIO.

Registered (user) port, 1024-49151 TCPUDP

IANA assignment

Service nameProtoDescriptionAssigneeReference
rfio TCP RFIO Frederic Hemmer -
rfio UDP RFIO Frederic Hemmer -

Check what is listening on port 3147

Linux: is anything listening on TCP 3147?
sudo ss -tlnp 'sport = :3147'
Linux: UDP 3147
sudo ss -ulnp 'sport = :3147'
Linux / macOS: which process owns the port
sudo lsof -nP -i :3147
Older Linux / BSD (net-tools)
sudo netstat -tlnp | grep ':3147 '
Windows (Command Prompt)
netstat -ano | findstr :3147
Windows (PowerShell)
Get-NetTCPConnection -LocalPort 3147 -State Listen | Select LocalAddress,OwningProcess

Test it from outside

From another machine
nc -vz -w 5 HOST 3147
From Windows
Test-NetConnection HOST -Port 3147
UDP probe (no reply does not prove it is closed)
nc -vzu -w 5 HOST 3147

Block port 3147 in the firewall

ufw
sudo ufw deny 3147/tcp
iptables
sudo iptables -A INPUT -p tcp --dport 3147 -j DROP
nftables
sudo nft add rule inet filter input tcp dport 3147 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block TCP 3147' -Direction Inbound -Protocol TCP -LocalPort 3147 -Action Block
ufw
sudo ufw deny 3147/udp
iptables
sudo iptables -A INPUT -p udp --dport 3147 -j DROP
nftables
sudo nft add rule inet filter input udp dport 3147 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block UDP 3147' -Direction Inbound -Protocol UDP -LocalPort 3147 -Action Block

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3145csi-lfap3146bears-023148nm-game-admin3149nm-game-server

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