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// Other services

Port 1840: netopia-vo2

Port 1840 is assigned by IANA to netopia-vo2 (netopia-vo2).

1840

How netopia-vo2 works

Other services
client:1840netopia-vo2response client:1840netopia-vo2response

The client sends a request to port 1840 and the netopia-vo2 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 1840 dangerous?

We have no specific security note for port 1840. 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 1840

ServicePortTransportDescriptionReferenceUpdated
netopia-vo2 1840 TCP, UDP netopia-vo2 - -

// source: IANA service name and port number registry

03 Check it

Which program uses port 1840, and is it reachable?

Linux

sudo ss -ltnup 'sport = :1840'      # process listening on 1840
sudo lsof -nP -i :1840

macOS

sudo lsof -nP -i :1840

Windows (PowerShell)

Get-NetTCPConnection -LocalPort 1840 -State Listen | Select LocalAddress, OwningProcess
Get-NetUDPEndpoint -LocalPort 1840
netstat -ano | findstr :1840

From another machine

nmap -p 1840 -sV <host>
sudo nmap -sU -p 1840 <host>
nc -zv <host> 1840

Block it in the firewall

sudo ufw deny 1840/tcp                                         # Linux (ufw)
New-NetFirewallRule -DisplayName "Block 1840" -Direction Inbound -LocalPort 1840 -Protocol TCP -Action Block  # Windows
04 FAQ
What is port 1840 used for?

Port 1840 is assigned by IANA to netopia-vo2 (netopia-vo2).

Is port 1840 TCP or UDP?

Port 1840 is registered for TCP and UDP.

Is it safe to open port 1840?

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 1840 is open?

On Linux run "ss -ltnup 'sport = :1840'", on macOS "lsof -nP -i :1840", and on Windows "netstat -ano | findstr :1840" to see the local process. From another machine, "nmap -p 1840 <host>" shows whether it is reachable.

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