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Port 1661 (netview-aix-1)

IANA assigns port 1661 to netview-aix-1.

Registered (user) port, 1024-49151 TCPUDP

IANA assignment

Service nameProtoDescriptionAssigneeReference
netview-aix-1 TCP netview-aix-1 - -
netview-aix-1 UDP netview-aix-1 - -

Check what is listening on port 1661

Linux: is anything listening on TCP 1661?
sudo ss -tlnp 'sport = :1661'
Linux: UDP 1661
sudo ss -ulnp 'sport = :1661'
Linux / macOS: which process owns the port
sudo lsof -nP -i :1661
Older Linux / BSD (net-tools)
sudo netstat -tlnp | grep ':1661 '
Windows (Command Prompt)
netstat -ano | findstr :1661
Windows (PowerShell)
Get-NetTCPConnection -LocalPort 1661 -State Listen | Select LocalAddress,OwningProcess

Test it from outside

From another machine
nc -vz -w 5 HOST 1661
From Windows
Test-NetConnection HOST -Port 1661
UDP probe (no reply does not prove it is closed)
nc -vzu -w 5 HOST 1661

Block port 1661 in the firewall

ufw
sudo ufw deny 1661/tcp
iptables
sudo iptables -A INPUT -p tcp --dport 1661 -j DROP
nftables
sudo nft add rule inet filter input tcp dport 1661 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block TCP 1661' -Direction Inbound -Protocol TCP -LocalPort 1661 -Action Block
ufw
sudo ufw deny 1661/udp
iptables
sudo iptables -A INPUT -p udp --dport 1661 -j DROP
nftables
sudo nft add rule inet filter input udp dport 1661 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block UDP 1661' -Direction Inbound -Protocol UDP -LocalPort 1661 -Action Block

Related ports

1659sg-lm1660skip-mc-gikreq1662netview-aix-21663netview-aix-3

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