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// Other services

Port 1842: netopia-vo4

Port 1842 is assigned by IANA to netopia-vo4 (netopia-vo4).

1842

How netopia-vo4 works

Other services
client:1842netopia-vo4response client:1842netopia-vo4response

The client sends a request to port 1842 and the netopia-vo4 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 1842 dangerous?

We have no specific security note for port 1842. 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 1842

ServicePortTransportDescriptionReferenceUpdated
netopia-vo4 1842 TCP, UDP netopia-vo4 - -

// source: IANA service name and port number registry

03 Check it

Which program uses port 1842, and is it reachable?

Linux

sudo ss -ltnup 'sport = :1842'      # process listening on 1842
sudo lsof -nP -i :1842

macOS

sudo lsof -nP -i :1842

Windows (PowerShell)

Get-NetTCPConnection -LocalPort 1842 -State Listen | Select LocalAddress, OwningProcess
Get-NetUDPEndpoint -LocalPort 1842
netstat -ano | findstr :1842

From another machine

nmap -p 1842 -sV <host>
sudo nmap -sU -p 1842 <host>
nc -zv <host> 1842

Block it in the firewall

sudo ufw deny 1842/tcp                                         # Linux (ufw)
New-NetFirewallRule -DisplayName "Block 1842" -Direction Inbound -LocalPort 1842 -Protocol TCP -Action Block  # Windows
04 FAQ
What is port 1842 used for?

Port 1842 is assigned by IANA to netopia-vo4 (netopia-vo4).

Is port 1842 TCP or UDP?

Port 1842 is registered for TCP and UDP.

Is it safe to open port 1842?

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 1842 is open?

On Linux run "ss -ltnup 'sport = :1842'", on macOS "lsof -nP -i :1842", and on Windows "netstat -ano | findstr :1842" to see the local process. From another machine, "nmap -p 1842 <host>" shows whether it is reachable.

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