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Port 1664 (netview-aix-4)

IANA assigns port 1664 to netview-aix-4.

Registered (user) port, 1024-49151 TCPUDP

IANA assignment

Service nameProtoDescriptionAssigneeReference
netview-aix-4 TCP netview-aix-4 - -
netview-aix-4 UDP netview-aix-4 - -

Check what is listening on port 1664

Linux: is anything listening on TCP 1664?
sudo ss -tlnp 'sport = :1664'
Linux: UDP 1664
sudo ss -ulnp 'sport = :1664'
Linux / macOS: which process owns the port
sudo lsof -nP -i :1664
Older Linux / BSD (net-tools)
sudo netstat -tlnp | grep ':1664 '
Windows (Command Prompt)
netstat -ano | findstr :1664
Windows (PowerShell)
Get-NetTCPConnection -LocalPort 1664 -State Listen | Select LocalAddress,OwningProcess

Test it from outside

From another machine
nc -vz -w 5 HOST 1664
From Windows
Test-NetConnection HOST -Port 1664
UDP probe (no reply does not prove it is closed)
nc -vzu -w 5 HOST 1664

Block port 1664 in the firewall

ufw
sudo ufw deny 1664/tcp
iptables
sudo iptables -A INPUT -p tcp --dport 1664 -j DROP
nftables
sudo nft add rule inet filter input tcp dport 1664 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block TCP 1664' -Direction Inbound -Protocol TCP -LocalPort 1664 -Action Block
ufw
sudo ufw deny 1664/udp
iptables
sudo iptables -A INPUT -p udp --dport 1664 -j DROP
nftables
sudo nft add rule inet filter input udp dport 1664 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block UDP 1664' -Direction Inbound -Protocol UDP -LocalPort 1664 -Action Block

Related ports

1662netview-aix-21663netview-aix-31665netview-aix-51666netview-aix-6

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