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// Other services

Port 690: Velneo Application Transfer Protocol

Port 690 is assigned by IANA to vatp (Velneo Application Transfer Protocol).

690

How vatp works

Other services
client:690vatpresponse client:690vatpresponse

The client sends a request to port 690 and the vatp 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
Well-known (0-1023)
Category
Other services
01 Security

Is port 690 dangerous?

We have no specific security note for port 690. 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 690

ServicePortTransportDescriptionReferenceUpdated
vatp 690 TCP, UDP Velneo Application Transfer Protocol - 2015-02-03

// source: IANA service name and port number registry

03 Check it

Which program uses port 690, and is it reachable?

Linux

sudo ss -ltnup 'sport = :690'      # process listening on 690
sudo lsof -nP -i :690

macOS

sudo lsof -nP -i :690

Windows (PowerShell)

Get-NetTCPConnection -LocalPort 690 -State Listen | Select LocalAddress, OwningProcess
Get-NetUDPEndpoint -LocalPort 690
netstat -ano | findstr :690

From another machine

nmap -p 690 -sV <host>
sudo nmap -sU -p 690 <host>
nc -zv <host> 690

Block it in the firewall

sudo ufw deny 690/tcp                                         # Linux (ufw)
New-NetFirewallRule -DisplayName "Block 690" -Direction Inbound -LocalPort 690 -Protocol TCP -Action Block  # Windows
04 FAQ
What is port 690 used for?

Port 690 is assigned by IANA to vatp (Velneo Application Transfer Protocol).

Is port 690 TCP or UDP?

Port 690 is registered for TCP and UDP.

Is it safe to open port 690?

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 690 is open?

On Linux run "ss -ltnup 'sport = :690'", on macOS "lsof -nP -i :690", and on Windows "netstat -ano | findstr :690" to see the local process. From another machine, "nmap -p 690 <host>" shows whether it is reachable.

05 Related
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