CyberHunter
Local dataset, no network
// Other services

Port 1641: InVision

Port 1641 is assigned by IANA to invision (InVision).

1641

How invision works

Other services
client:1641invisionresponse client:1641invisionresponse

The client sends a request to port 1641 and the invision 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 1641 dangerous?

We have no specific security note for port 1641. 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 1641

ServicePortTransportDescriptionReferenceUpdated
invision 1641 TCP, UDP InVision - -

// source: IANA service name and port number registry

03 Check it

Which program uses port 1641, and is it reachable?

Linux

sudo ss -ltnup 'sport = :1641'      # process listening on 1641
sudo lsof -nP -i :1641

macOS

sudo lsof -nP -i :1641

Windows (PowerShell)

Get-NetTCPConnection -LocalPort 1641 -State Listen | Select LocalAddress, OwningProcess
Get-NetUDPEndpoint -LocalPort 1641
netstat -ano | findstr :1641

From another machine

nmap -p 1641 -sV <host>
sudo nmap -sU -p 1641 <host>
nc -zv <host> 1641

Block it in the firewall

sudo ufw deny 1641/tcp                                         # Linux (ufw)
New-NetFirewallRule -DisplayName "Block 1641" -Direction Inbound -LocalPort 1641 -Protocol TCP -Action Block  # Windows
04 FAQ
What is port 1641 used for?

Port 1641 is assigned by IANA to invision (InVision).

Is port 1641 TCP or UDP?

Port 1641 is registered for TCP and UDP.

Is it safe to open port 1641?

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 1641 is open?

On Linux run "ss -ltnup 'sport = :1641'", on macOS "lsof -nP -i :1641", and on Windows "netstat -ano | findstr :1641" to see the local process. From another machine, "nmap -p 1641 <host>" shows whether it is reachable.

05 Related
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