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Port 3569 (mbg-ctrl)

IANA assigns port 3569 to mbg-ctrl: Meinberg Control Service.

Registered (user) port, 1024-49151 TCPUDP

IANA assignment

Service nameProtoDescriptionAssigneeReference
mbg-ctrl TCP Meinberg Control Service Meinberg Funkuhren GmbH Co KG -
mbg-ctrl UDP Meinberg Control Service Meinberg Funkuhren GmbH Co KG -

Registry dates for this port: registered 2002-08, last modified 2019-04-23.

Check what is listening on port 3569

Linux: is anything listening on TCP 3569?
sudo ss -tlnp 'sport = :3569'
Linux: UDP 3569
sudo ss -ulnp 'sport = :3569'
Linux / macOS: which process owns the port
sudo lsof -nP -i :3569
Older Linux / BSD (net-tools)
sudo netstat -tlnp | grep ':3569 '
Windows (Command Prompt)
netstat -ano | findstr :3569
Windows (PowerShell)
Get-NetTCPConnection -LocalPort 3569 -State Listen | Select LocalAddress,OwningProcess

Test it from outside

From another machine
nc -vz -w 5 HOST 3569
From Windows
Test-NetConnection HOST -Port 3569
UDP probe (no reply does not prove it is closed)
nc -vzu -w 5 HOST 3569

Block port 3569 in the firewall

ufw
sudo ufw deny 3569/tcp
iptables
sudo iptables -A INPUT -p tcp --dport 3569 -j DROP
nftables
sudo nft add rule inet filter input tcp dport 3569 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block TCP 3569' -Direction Inbound -Protocol TCP -LocalPort 3569 -Action Block
ufw
sudo ufw deny 3569/udp
iptables
sudo iptables -A INPUT -p udp --dport 3569 -j DROP
nftables
sudo nft add rule inet filter input udp dport 3569 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block UDP 3569' -Direction Inbound -Protocol UDP -LocalPort 3569 -Action Block

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