CyberHunter
Local dataset, no network
// Other services

Port 1631: Visit view

Port 1631 is assigned by IANA to visitview (Visit view).

1631

How visitview works

Other services
client:1631visitviewresponse client:1631visitviewresponse

The client sends a request to port 1631 and the visitview 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 1631 dangerous?

We have no specific security note for port 1631. 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 1631

ServicePortTransportDescriptionReferenceUpdated
visitview 1631 TCP, UDP Visit view - -

// source: IANA service name and port number registry

03 Check it

Which program uses port 1631, and is it reachable?

Linux

sudo ss -ltnup 'sport = :1631'      # process listening on 1631
sudo lsof -nP -i :1631

macOS

sudo lsof -nP -i :1631

Windows (PowerShell)

Get-NetTCPConnection -LocalPort 1631 -State Listen | Select LocalAddress, OwningProcess
Get-NetUDPEndpoint -LocalPort 1631
netstat -ano | findstr :1631

From another machine

nmap -p 1631 -sV <host>
sudo nmap -sU -p 1631 <host>
nc -zv <host> 1631

Block it in the firewall

sudo ufw deny 1631/tcp                                         # Linux (ufw)
New-NetFirewallRule -DisplayName "Block 1631" -Direction Inbound -LocalPort 1631 -Protocol TCP -Action Block  # Windows
04 FAQ
What is port 1631 used for?

Port 1631 is assigned by IANA to visitview (Visit view).

Is port 1631 TCP or UDP?

Port 1631 is registered for TCP and UDP.

Is it safe to open port 1631?

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 1631 is open?

On Linux run "ss -ltnup 'sport = :1631'", on macOS "lsof -nP -i :1631", and on Windows "netstat -ano | findstr :1631" to see the local process. From another machine, "nmap -p 1631 <host>" shows whether it is reachable.

05 Related
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