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Port 18183 (opsec-sam)

IANA assigns port 18183 to opsec-sam: OPSEC SAM.

Registered (user) port, 1024-49151 TCPUDP

IANA assignment

Service nameProtoDescriptionAssigneeReference
opsec-sam TCP OPSEC SAM Alon Kantor -
opsec-sam UDP OPSEC SAM Alon Kantor -

Check what is listening on port 18183

Linux: is anything listening on TCP 18183?
sudo ss -tlnp 'sport = :18183'
Linux: UDP 18183
sudo ss -ulnp 'sport = :18183'
Linux / macOS: which process owns the port
sudo lsof -nP -i :18183
Older Linux / BSD (net-tools)
sudo netstat -tlnp | grep ':18183 '
Windows (Command Prompt)
netstat -ano | findstr :18183
Windows (PowerShell)
Get-NetTCPConnection -LocalPort 18183 -State Listen | Select LocalAddress,OwningProcess

Test it from outside

From another machine
nc -vz -w 5 HOST 18183
From Windows
Test-NetConnection HOST -Port 18183
UDP probe (no reply does not prove it is closed)
nc -vzu -w 5 HOST 18183

Block port 18183 in the firewall

ufw
sudo ufw deny 18183/tcp
iptables
sudo iptables -A INPUT -p tcp --dport 18183 -j DROP
nftables
sudo nft add rule inet filter input tcp dport 18183 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block TCP 18183' -Direction Inbound -Protocol TCP -LocalPort 18183 -Action Block
ufw
sudo ufw deny 18183/udp
iptables
sudo iptables -A INPUT -p udp --dport 18183 -j DROP
nftables
sudo nft add rule inet filter input udp dport 18183 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block UDP 18183' -Direction Inbound -Protocol UDP -LocalPort 18183 -Action Block

Related ports

18181opsec-cvp18182opsec-ufp18184opsec-lea18185opsec-omi

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