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Port 1666 (netview-aix-6)

IANA assigns port 1666 to netview-aix-6.

Registered (user) port, 1024-49151 TCPUDP

IANA assignment

Service nameProtoDescriptionAssigneeReference
netview-aix-6 TCP netview-aix-6 - -
netview-aix-6 UDP netview-aix-6 - -

Check what is listening on port 1666

Linux: is anything listening on TCP 1666?
sudo ss -tlnp 'sport = :1666'
Linux: UDP 1666
sudo ss -ulnp 'sport = :1666'
Linux / macOS: which process owns the port
sudo lsof -nP -i :1666
Older Linux / BSD (net-tools)
sudo netstat -tlnp | grep ':1666 '
Windows (Command Prompt)
netstat -ano | findstr :1666
Windows (PowerShell)
Get-NetTCPConnection -LocalPort 1666 -State Listen | Select LocalAddress,OwningProcess

Test it from outside

From another machine
nc -vz -w 5 HOST 1666
From Windows
Test-NetConnection HOST -Port 1666
UDP probe (no reply does not prove it is closed)
nc -vzu -w 5 HOST 1666

Block port 1666 in the firewall

ufw
sudo ufw deny 1666/tcp
iptables
sudo iptables -A INPUT -p tcp --dport 1666 -j DROP
nftables
sudo nft add rule inet filter input tcp dport 1666 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block TCP 1666' -Direction Inbound -Protocol TCP -LocalPort 1666 -Action Block
ufw
sudo ufw deny 1666/udp
iptables
sudo iptables -A INPUT -p udp --dport 1666 -j DROP
nftables
sudo nft add rule inet filter input udp dport 1666 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block UDP 1666' -Direction Inbound -Protocol UDP -LocalPort 1666 -Action Block

Related ports

1664netview-aix-41665netview-aix-51667netview-aix-71668netview-aix-8

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