CyberHunter
Local dataset, no network
// Other services

Port 1665: netview-aix-5

Port 1665 is assigned by IANA to netview-aix-5 (netview-aix-5).

1665

How netview-aix-5 works

Other services
client:1665netview-aix-5response client:1665netview-aix-5response

The client sends a request to port 1665 and the netview-aix-5 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 1665 dangerous?

We have no specific security note for port 1665. 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 1665

ServicePortTransportDescriptionReferenceUpdated
netview-aix-5 1665 TCP, UDP netview-aix-5 - -

// source: IANA service name and port number registry

03 Check it

Which program uses port 1665, and is it reachable?

Linux

sudo ss -ltnup 'sport = :1665'      # process listening on 1665
sudo lsof -nP -i :1665

macOS

sudo lsof -nP -i :1665

Windows (PowerShell)

Get-NetTCPConnection -LocalPort 1665 -State Listen | Select LocalAddress, OwningProcess
Get-NetUDPEndpoint -LocalPort 1665
netstat -ano | findstr :1665

From another machine

nmap -p 1665 -sV <host>
sudo nmap -sU -p 1665 <host>
nc -zv <host> 1665

Block it in the firewall

sudo ufw deny 1665/tcp                                         # Linux (ufw)
New-NetFirewallRule -DisplayName "Block 1665" -Direction Inbound -LocalPort 1665 -Protocol TCP -Action Block  # Windows
04 FAQ
What is port 1665 used for?

Port 1665 is assigned by IANA to netview-aix-5 (netview-aix-5).

Is port 1665 TCP or UDP?

Port 1665 is registered for TCP and UDP.

Is it safe to open port 1665?

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 1665 is open?

On Linux run "ss -ltnup 'sport = :1665'", on macOS "lsof -nP -i :1665", and on Windows "netstat -ano | findstr :1665" to see the local process. From another machine, "nmap -p 1665 <host>" shows whether it is reachable.

05 Related
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