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Port 3043 (brp)

IANA assigns port 3043 to brp: Broadcast Routing Protocol.

Registered (user) port, 1024-49151 TCPUDP

IANA assignment

Service nameProtoDescriptionAssigneeReference
brp TCP Broadcast Routing Protocol John Border -
brp UDP Broadcast Routing Protocol John Border -

Check what is listening on port 3043

Linux: is anything listening on TCP 3043?
sudo ss -tlnp 'sport = :3043'
Linux: UDP 3043
sudo ss -ulnp 'sport = :3043'
Linux / macOS: which process owns the port
sudo lsof -nP -i :3043
Older Linux / BSD (net-tools)
sudo netstat -tlnp | grep ':3043 '
Windows (Command Prompt)
netstat -ano | findstr :3043
Windows (PowerShell)
Get-NetTCPConnection -LocalPort 3043 -State Listen | Select LocalAddress,OwningProcess

Test it from outside

From another machine
nc -vz -w 5 HOST 3043
From Windows
Test-NetConnection HOST -Port 3043
UDP probe (no reply does not prove it is closed)
nc -vzu -w 5 HOST 3043

Block port 3043 in the firewall

ufw
sudo ufw deny 3043/tcp
iptables
sudo iptables -A INPUT -p tcp --dport 3043 -j DROP
nftables
sudo nft add rule inet filter input tcp dport 3043 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block TCP 3043' -Direction Inbound -Protocol TCP -LocalPort 3043 -Action Block
ufw
sudo ufw deny 3043/udp
iptables
sudo iptables -A INPUT -p udp --dport 3043 -j DROP
nftables
sudo nft add rule inet filter input udp dport 3043 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block UDP 3043' -Direction Inbound -Protocol UDP -LocalPort 3043 -Action Block

Related ports

3041di-traceware3042journee3044epp3045responsenet

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