HTTPfy

Port 1663 (netview-aix-3)

IANA assigns port 1663 to netview-aix-3.

Registered (user) port, 1024-49151 TCPUDP

IANA assignment

Service nameProtoDescriptionAssigneeReference
netview-aix-3 TCP netview-aix-3 - -
netview-aix-3 UDP netview-aix-3 - -

Check what is listening on port 1663

Linux: is anything listening on TCP 1663?
sudo ss -tlnp 'sport = :1663'
Linux: UDP 1663
sudo ss -ulnp 'sport = :1663'
Linux / macOS: which process owns the port
sudo lsof -nP -i :1663
Older Linux / BSD (net-tools)
sudo netstat -tlnp | grep ':1663 '
Windows (Command Prompt)
netstat -ano | findstr :1663
Windows (PowerShell)
Get-NetTCPConnection -LocalPort 1663 -State Listen | Select LocalAddress,OwningProcess

Test it from outside

From another machine
nc -vz -w 5 HOST 1663
From Windows
Test-NetConnection HOST -Port 1663
UDP probe (no reply does not prove it is closed)
nc -vzu -w 5 HOST 1663

Block port 1663 in the firewall

ufw
sudo ufw deny 1663/tcp
iptables
sudo iptables -A INPUT -p tcp --dport 1663 -j DROP
nftables
sudo nft add rule inet filter input tcp dport 1663 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block TCP 1663' -Direction Inbound -Protocol TCP -LocalPort 1663 -Action Block
ufw
sudo ufw deny 1663/udp
iptables
sudo iptables -A INPUT -p udp --dport 1663 -j DROP
nftables
sudo nft add rule inet filter input udp dport 1663 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block UDP 1663' -Direction Inbound -Protocol UDP -LocalPort 1663 -Action Block

Related ports

1661netview-aix-11662netview-aix-21664netview-aix-41665netview-aix-5

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