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Port 47000 (mbus)

IANA assigns port 47000 to mbus: Message Bus.

Registered (user) port, 1024-49151 TCPUDP

IANA assignment

Service nameProtoDescriptionAssigneeReference
mbus TCP Message Bus Dirk Kutscher -
mbus UDP Message Bus Dirk Kutscher -

Check what is listening on port 47000

Linux: is anything listening on TCP 47000?
sudo ss -tlnp 'sport = :47000'
Linux: UDP 47000
sudo ss -ulnp 'sport = :47000'
Linux / macOS: which process owns the port
sudo lsof -nP -i :47000
Older Linux / BSD (net-tools)
sudo netstat -tlnp | grep ':47000 '
Windows (Command Prompt)
netstat -ano | findstr :47000
Windows (PowerShell)
Get-NetTCPConnection -LocalPort 47000 -State Listen | Select LocalAddress,OwningProcess

Test it from outside

From another machine
nc -vz -w 5 HOST 47000
From Windows
Test-NetConnection HOST -Port 47000
UDP probe (no reply does not prove it is closed)
nc -vzu -w 5 HOST 47000

Block port 47000 in the firewall

ufw
sudo ufw deny 47000/tcp
iptables
sudo iptables -A INPUT -p tcp --dport 47000 -j DROP
nftables
sudo nft add rule inet filter input tcp dport 47000 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block TCP 47000' -Direction Inbound -Protocol TCP -LocalPort 47000 -Action Block
ufw
sudo ufw deny 47000/udp
iptables
sudo iptables -A INPUT -p udp --dport 47000 -j DROP
nftables
sudo nft add rule inet filter input udp dport 47000 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block UDP 47000' -Direction Inbound -Protocol UDP -LocalPort 47000 -Action Block

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