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Port 18668 (vdmmesh, vdmmesh-disc)

IANA assigns port 18668 to vdmmesh, vdmmesh-disc: Manufacturing Execution Systems Mesh Communication.

Registered (user) port, 1024-49151 TCPUDP

IANA assignment

Service nameProtoDescriptionAssigneeReference
vdmmesh TCP Manufacturing Execution Systems Mesh Communication Van Doren MES -
vdmmesh-disc UDP Manufacturing Execution Systems Mesh Communication Van Doren MES -

Registry dates for this port: registered 2016-10-31.

Check what is listening on port 18668

Linux: is anything listening on TCP 18668?
sudo ss -tlnp 'sport = :18668'
Linux: UDP 18668
sudo ss -ulnp 'sport = :18668'
Linux / macOS: which process owns the port
sudo lsof -nP -i :18668
Older Linux / BSD (net-tools)
sudo netstat -tlnp | grep ':18668 '
Windows (Command Prompt)
netstat -ano | findstr :18668
Windows (PowerShell)
Get-NetTCPConnection -LocalPort 18668 -State Listen | Select LocalAddress,OwningProcess

Test it from outside

From another machine
nc -vz -w 5 HOST 18668
From Windows
Test-NetConnection HOST -Port 18668
UDP probe (no reply does not prove it is closed)
nc -vzu -w 5 HOST 18668

Block port 18668 in the firewall

ufw
sudo ufw deny 18668/tcp
iptables
sudo iptables -A INPUT -p tcp --dport 18668 -j DROP
nftables
sudo nft add rule inet filter input tcp dport 18668 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block TCP 18668' -Direction Inbound -Protocol TCP -LocalPort 18668 -Action Block
ufw
sudo ufw deny 18668/udp
iptables
sudo iptables -A INPUT -p udp --dport 18668 -j DROP
nftables
sudo nft add rule inet filter input udp dport 18668 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block UDP 18668' -Direction Inbound -Protocol UDP -LocalPort 18668 -Action Block

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