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// Other services

Port 1843: netopia-vo5

Port 1843 is assigned by IANA to netopia-vo5 (netopia-vo5).

1843

How netopia-vo5 works

Other services
client:1843netopia-vo5response client:1843netopia-vo5response

The client sends a request to port 1843 and the netopia-vo5 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 1843 dangerous?

We have no specific security note for port 1843. 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 1843

ServicePortTransportDescriptionReferenceUpdated
netopia-vo5 1843 TCP, UDP netopia-vo5 - -

// source: IANA service name and port number registry

03 Check it

Which program uses port 1843, and is it reachable?

Linux

sudo ss -ltnup 'sport = :1843'      # process listening on 1843
sudo lsof -nP -i :1843

macOS

sudo lsof -nP -i :1843

Windows (PowerShell)

Get-NetTCPConnection -LocalPort 1843 -State Listen | Select LocalAddress, OwningProcess
Get-NetUDPEndpoint -LocalPort 1843
netstat -ano | findstr :1843

From another machine

nmap -p 1843 -sV <host>
sudo nmap -sU -p 1843 <host>
nc -zv <host> 1843

Block it in the firewall

sudo ufw deny 1843/tcp                                         # Linux (ufw)
New-NetFirewallRule -DisplayName "Block 1843" -Direction Inbound -LocalPort 1843 -Protocol TCP -Action Block  # Windows
04 FAQ
What is port 1843 used for?

Port 1843 is assigned by IANA to netopia-vo5 (netopia-vo5).

Is port 1843 TCP or UDP?

Port 1843 is registered for TCP and UDP.

Is it safe to open port 1843?

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 1843 is open?

On Linux run "ss -ltnup 'sport = :1843'", on macOS "lsof -nP -i :1843", and on Windows "netstat -ano | findstr :1843" to see the local process. From another machine, "nmap -p 1843 <host>" shows whether it is reachable.

05 Related
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