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Port 18187 (opsec-ela)

IANA assigns port 18187 to opsec-ela: OPSEC ELA.

Registered (user) port, 1024-49151 TCPUDP

IANA assignment

Service nameProtoDescriptionAssigneeReference
opsec-ela TCP OPSEC ELA Alon Kantor -
opsec-ela UDP OPSEC ELA Alon Kantor -

Check what is listening on port 18187

Linux: is anything listening on TCP 18187?
sudo ss -tlnp 'sport = :18187'
Linux: UDP 18187
sudo ss -ulnp 'sport = :18187'
Linux / macOS: which process owns the port
sudo lsof -nP -i :18187
Older Linux / BSD (net-tools)
sudo netstat -tlnp | grep ':18187 '
Windows (Command Prompt)
netstat -ano | findstr :18187
Windows (PowerShell)
Get-NetTCPConnection -LocalPort 18187 -State Listen | Select LocalAddress,OwningProcess

Test it from outside

From another machine
nc -vz -w 5 HOST 18187
From Windows
Test-NetConnection HOST -Port 18187
UDP probe (no reply does not prove it is closed)
nc -vzu -w 5 HOST 18187

Block port 18187 in the firewall

ufw
sudo ufw deny 18187/tcp
iptables
sudo iptables -A INPUT -p tcp --dport 18187 -j DROP
nftables
sudo nft add rule inet filter input tcp dport 18187 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block TCP 18187' -Direction Inbound -Protocol TCP -LocalPort 18187 -Action Block
ufw
sudo ufw deny 18187/udp
iptables
sudo iptables -A INPUT -p udp --dport 18187 -j DROP
nftables
sudo nft add rule inet filter input udp dport 18187 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block UDP 18187' -Direction Inbound -Protocol UDP -LocalPort 18187 -Action Block

Related ports

18185opsec-omi18186ohsc18241checkpoint-rtm18242iclid

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