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Port 3180 (mc-brk-srv)

IANA assigns port 3180 to mc-brk-srv: Millicent Broker Server.

Registered (user) port, 1024-49151 TCPUDP

IANA assignment

Service nameProtoDescriptionAssigneeReference
mc-brk-srv TCP Millicent Broker Server Steve Glassman -
mc-brk-srv UDP Millicent Broker Server Steve Glassman -

Check what is listening on port 3180

Linux: is anything listening on TCP 3180?
sudo ss -tlnp 'sport = :3180'
Linux: UDP 3180
sudo ss -ulnp 'sport = :3180'
Linux / macOS: which process owns the port
sudo lsof -nP -i :3180
Older Linux / BSD (net-tools)
sudo netstat -tlnp | grep ':3180 '
Windows (Command Prompt)
netstat -ano | findstr :3180
Windows (PowerShell)
Get-NetTCPConnection -LocalPort 3180 -State Listen | Select LocalAddress,OwningProcess

Test it from outside

From another machine
nc -vz -w 5 HOST 3180
From Windows
Test-NetConnection HOST -Port 3180
UDP probe (no reply does not prove it is closed)
nc -vzu -w 5 HOST 3180

Block port 3180 in the firewall

ufw
sudo ufw deny 3180/tcp
iptables
sudo iptables -A INPUT -p tcp --dport 3180 -j DROP
nftables
sudo nft add rule inet filter input tcp dport 3180 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block TCP 3180' -Direction Inbound -Protocol TCP -LocalPort 3180 -Action Block
ufw
sudo ufw deny 3180/udp
iptables
sudo iptables -A INPUT -p udp --dport 3180 -j DROP
nftables
sudo nft add rule inet filter input udp dport 3180 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block UDP 3180' -Direction Inbound -Protocol UDP -LocalPort 3180 -Action Block

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