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Port 4130 (fronet)

IANA assigns port 4130 to fronet: FRONET message protocol.

Registered (user) port, 1024-49151 TCPUDP

IANA assignment

Service nameProtoDescriptionAssigneeReference
fronet TCP FRONET message protocol Christer Nygren -
fronet UDP FRONET message protocol Christer Nygren -

Registry dates for this port: registered 2007-08-07.

Check what is listening on port 4130

Linux: is anything listening on TCP 4130?
sudo ss -tlnp 'sport = :4130'
Linux: UDP 4130
sudo ss -ulnp 'sport = :4130'
Linux / macOS: which process owns the port
sudo lsof -nP -i :4130
Older Linux / BSD (net-tools)
sudo netstat -tlnp | grep ':4130 '
Windows (Command Prompt)
netstat -ano | findstr :4130
Windows (PowerShell)
Get-NetTCPConnection -LocalPort 4130 -State Listen | Select LocalAddress,OwningProcess

Test it from outside

From another machine
nc -vz -w 5 HOST 4130
From Windows
Test-NetConnection HOST -Port 4130
UDP probe (no reply does not prove it is closed)
nc -vzu -w 5 HOST 4130

Block port 4130 in the firewall

ufw
sudo ufw deny 4130/tcp
iptables
sudo iptables -A INPUT -p tcp --dport 4130 -j DROP
nftables
sudo nft add rule inet filter input tcp dport 4130 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block TCP 4130' -Direction Inbound -Protocol TCP -LocalPort 4130 -Action Block
ufw
sudo ufw deny 4130/udp
iptables
sudo iptables -A INPUT -p udp --dport 4130 -j DROP
nftables
sudo nft add rule inet filter input udp dport 4130 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block UDP 4130' -Direction Inbound -Protocol UDP -LocalPort 4130 -Action Block

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