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Port 3183 (cops-tls)

IANA assigns port 3183 to cops-tls: COPS/TLS.

Registered (user) port, 1024-49151 TCPUDP

IANA assignment

Service nameProtoDescriptionAssigneeReference
cops-tls TCP COPS/TLS Mark Stevens -
cops-tls UDP COPS/TLS Mark Stevens -

Check what is listening on port 3183

Linux: is anything listening on TCP 3183?
sudo ss -tlnp 'sport = :3183'
Linux: UDP 3183
sudo ss -ulnp 'sport = :3183'
Linux / macOS: which process owns the port
sudo lsof -nP -i :3183
Older Linux / BSD (net-tools)
sudo netstat -tlnp | grep ':3183 '
Windows (Command Prompt)
netstat -ano | findstr :3183
Windows (PowerShell)
Get-NetTCPConnection -LocalPort 3183 -State Listen | Select LocalAddress,OwningProcess

Test it from outside

From another machine
nc -vz -w 5 HOST 3183
From Windows
Test-NetConnection HOST -Port 3183
UDP probe (no reply does not prove it is closed)
nc -vzu -w 5 HOST 3183

Block port 3183 in the firewall

ufw
sudo ufw deny 3183/tcp
iptables
sudo iptables -A INPUT -p tcp --dport 3183 -j DROP
nftables
sudo nft add rule inet filter input tcp dport 3183 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block TCP 3183' -Direction Inbound -Protocol TCP -LocalPort 3183 -Action Block
ufw
sudo ufw deny 3183/udp
iptables
sudo iptables -A INPUT -p udp --dport 3183 -j DROP
nftables
sudo nft add rule inet filter input udp dport 3183 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block UDP 3183' -Direction Inbound -Protocol UDP -LocalPort 3183 -Action Block

Related ports

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