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Port 712 (tbrpf)

IANA assigns port 712 to tbrpf: TBRPF.

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

IANA assignment

Service nameProtoDescriptionAssigneeReference
tbrpf TCP TBRPF - RFC 3684
tbrpf UDP TBRPF - RFC 3684

Check what is listening on port 712

Linux: is anything listening on TCP 712?
sudo ss -tlnp 'sport = :712'
Linux: UDP 712
sudo ss -ulnp 'sport = :712'
Linux / macOS: which process owns the port
sudo lsof -nP -i :712
Older Linux / BSD (net-tools)
sudo netstat -tlnp | grep ':712 '
Windows (Command Prompt)
netstat -ano | findstr :712
Windows (PowerShell)
Get-NetTCPConnection -LocalPort 712 -State Listen | Select LocalAddress,OwningProcess

Test it from outside

From another machine
nc -vz -w 5 HOST 712
From Windows
Test-NetConnection HOST -Port 712
UDP probe (no reply does not prove it is closed)
nc -vzu -w 5 HOST 712

Block port 712 in the firewall

ufw
sudo ufw deny 712/tcp
iptables
sudo iptables -A INPUT -p tcp --dport 712 -j DROP
nftables
sudo nft add rule inet filter input tcp dport 712 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block TCP 712' -Direction Inbound -Protocol TCP -LocalPort 712 -Action Block
ufw
sudo ufw deny 712/udp
iptables
sudo iptables -A INPUT -p udp --dport 712 -j DROP
nftables
sudo nft add rule inet filter input udp dport 712 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block UDP 712' -Direction Inbound -Protocol UDP -LocalPort 712 -Action Block

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