Port 3288 (cops)

IANA assigns port 3288 to cops: COPS.

Registered (user) port, 1024-49151 TCPUDP

IANA assignment

Service nameProtoDescriptionAssigneeReference

cops TCP COPS Shai Herzog -

cops UDP COPS Shai Herzog -

Linux: is anything listening on TCP 3288?

sudo ss -tlnp 'sport = :3288'

Linux: UDP 3288

sudo ss -ulnp 'sport = :3288'

Linux / macOS: which process owns the port

sudo lsof -nP -i :3288

Older Linux / BSD (net-tools)

sudo netstat -tlnp | grep ':3288 '

Windows (Command Prompt)

netstat -ano | findstr :3288

Windows (PowerShell)

Get-NetTCPConnection -LocalPort 3288 -State Listen | Select LocalAddress,OwningProcess

From another machine

nc -vz -w 5 HOST 3288

From Windows

Test-NetConnection HOST -Port 3288

UDP probe (no reply does not prove it is closed)

nc -vzu -w 5 HOST 3288

ufw

sudo ufw deny 3288/tcp

iptables

sudo iptables -A INPUT -p tcp --dport 3288 -j DROP

nftables

sudo nft add rule inet filter input tcp dport 3288 drop

Windows Firewall

New-NetFirewallRule -DisplayName 'Block TCP 3288' -Direction Inbound -Protocol TCP -LocalPort 3288 -Action Block

ufw

sudo ufw deny 3288/udp

iptables

sudo iptables -A INPUT -p udp --dport 3288 -j DROP

nftables

sudo nft add rule inet filter input udp dport 3288 drop

Windows Firewall

New-NetFirewallRule -DisplayName 'Block UDP 3288' -Direction Inbound -Protocol UDP -LocalPort 3288 -Action Block

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