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// Other services

Port 1894: O2Server Port

Port 1894 is assigned by IANA to o2server-port (O2Server Port).

1894

How o2server-port works

Other services
client:1894o2server-portresponse client:1894o2server-portresponse

The client sends a request to port 1894 and the o2server-port 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 1894 dangerous?

We have no specific security note for port 1894. 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 1894

ServicePortTransportDescriptionReferenceUpdated
o2server-port 1894 TCP, UDP O2Server Port - -

// source: IANA service name and port number registry

03 Check it

Which program uses port 1894, and is it reachable?

Linux

sudo ss -ltnup 'sport = :1894'      # process listening on 1894
sudo lsof -nP -i :1894

macOS

sudo lsof -nP -i :1894

Windows (PowerShell)

Get-NetTCPConnection -LocalPort 1894 -State Listen | Select LocalAddress, OwningProcess
Get-NetUDPEndpoint -LocalPort 1894
netstat -ano | findstr :1894

From another machine

nmap -p 1894 -sV <host>
sudo nmap -sU -p 1894 <host>
nc -zv <host> 1894

Block it in the firewall

sudo ufw deny 1894/tcp                                         # Linux (ufw)
New-NetFirewallRule -DisplayName "Block 1894" -Direction Inbound -LocalPort 1894 -Protocol TCP -Action Block  # Windows
04 FAQ
What is port 1894 used for?

Port 1894 is assigned by IANA to o2server-port (O2Server Port).

Is port 1894 TCP or UDP?

Port 1894 is registered for TCP and UDP.

Is it safe to open port 1894?

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 1894 is open?

On Linux run "ss -ltnup 'sport = :1894'", on macOS "lsof -nP -i :1894", and on Windows "netstat -ano | findstr :1894" to see the local process. From another machine, "nmap -p 1894 <host>" shows whether it is reachable.

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