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Port 18000 (biimenu)

IANA assigns port 18000 to biimenu: Beckman Instruments, Inc..

Registered (user) port, 1024-49151 TCPUDP

IANA assignment

Service nameProtoDescriptionAssigneeReference
biimenu TCP Beckman Instruments, Inc. R L Meyering -
biimenu UDP Beckman Instruments, Inc. R L Meyering -

Check what is listening on port 18000

Linux: is anything listening on TCP 18000?
sudo ss -tlnp 'sport = :18000'
Linux: UDP 18000
sudo ss -ulnp 'sport = :18000'
Linux / macOS: which process owns the port
sudo lsof -nP -i :18000
Older Linux / BSD (net-tools)
sudo netstat -tlnp | grep ':18000 '
Windows (Command Prompt)
netstat -ano | findstr :18000
Windows (PowerShell)
Get-NetTCPConnection -LocalPort 18000 -State Listen | Select LocalAddress,OwningProcess

Test it from outside

From another machine
nc -vz -w 5 HOST 18000
From Windows
Test-NetConnection HOST -Port 18000
UDP probe (no reply does not prove it is closed)
nc -vzu -w 5 HOST 18000

Block port 18000 in the firewall

ufw
sudo ufw deny 18000/tcp
iptables
sudo iptables -A INPUT -p tcp --dport 18000 -j DROP
nftables
sudo nft add rule inet filter input tcp dport 18000 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block TCP 18000' -Direction Inbound -Protocol TCP -LocalPort 18000 -Action Block
ufw
sudo ufw deny 18000/udp
iptables
sudo iptables -A INPUT -p udp --dport 18000 -j DROP
nftables
sudo nft add rule inet filter input udp dport 18000 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block UDP 18000' -Direction Inbound -Protocol UDP -LocalPort 18000 -Action Block

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