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// Other services

Port 1661: netview-aix-1

Port 1661 is assigned by IANA to netview-aix-1 (netview-aix-1).

1661

How netview-aix-1 works

Other services
client:1661netview-aix-1response client:1661netview-aix-1response

The client sends a request to port 1661 and the netview-aix-1 service answers.

Transport
TCP · UDP
Exposure risk
not rated depends on the program listening
Encryption
Unknownnot stated by the registry
IANA status
Assigned1 registered service
Range
Registered (1024-49151)
Category
Other services
01 Security

Is port 1661 dangerous?

We have no specific security note for port 1661. Its risk depends on the program actually listening on it. General advice for other services services:

  • Close the port if nothing on the host needs it.
  • Identify the process that listens on it (commands below) before opening it in a firewall.
  • Expose a service only to the networks that use it.
02 Registry

IANA registry entries for port 1661

ServicePortTransportDescriptionReferenceUpdated
netview-aix-1 1661 TCP, UDP netview-aix-1 - -

// source: IANA service name and port number registry

03 Check it

Which program uses port 1661, and is it reachable?

Linux

sudo ss -ltnup 'sport = :1661'      # process listening on 1661
sudo lsof -nP -i :1661

macOS

sudo lsof -nP -i :1661

Windows (PowerShell)

Get-NetTCPConnection -LocalPort 1661 -State Listen | Select LocalAddress, OwningProcess
Get-NetUDPEndpoint -LocalPort 1661
netstat -ano | findstr :1661

From another machine

nmap -p 1661 -sV <host>
sudo nmap -sU -p 1661 <host>
nc -zv <host> 1661

Block it in the firewall

sudo ufw deny 1661/tcp                                         # Linux (ufw)
New-NetFirewallRule -DisplayName "Block 1661" -Direction Inbound -LocalPort 1661 -Protocol TCP -Action Block  # Windows
04 FAQ
What is port 1661 used for?

Port 1661 is assigned by IANA to netview-aix-1 (netview-aix-1).

Is port 1661 TCP or UDP?

Port 1661 is registered for TCP and UDP.

Is it safe to open port 1661?

It depends on the program that listens on it. Open it only for a service you know and only to the networks that need it. Close the port if nothing on the host needs it.

How do I check if port 1661 is open?

On Linux run "ss -ltnup 'sport = :1661'", on macOS "lsof -nP -i :1661", and on Windows "netstat -ano | findstr :1661" to see the local process. From another machine, "nmap -p 1661 <host>" shows whether it is reachable.

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