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// Other services

Port 2891: CINEGRFX-ELMD License Manager

Port 2891 is assigned by IANA to cinegrfx-elmd (CINEGRFX-ELMD License Manager).

2891

How cinegrfx-elmd works

Other services
client:2891cinegrfx-elmdresponse client:2891cinegrfx-elmdresponse

The client sends a request to port 2891 and the cinegrfx-elmd 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 2891 dangerous?

We have no specific security note for port 2891. 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 2891

ServicePortTransportDescriptionReferenceUpdated
cinegrfx-elmd 2891 TCP, UDP CINEGRFX-ELMD License Manager - -

// source: IANA service name and port number registry

03 Check it

Which program uses port 2891, and is it reachable?

Linux

sudo ss -ltnup 'sport = :2891'      # process listening on 2891
sudo lsof -nP -i :2891

macOS

sudo lsof -nP -i :2891

Windows (PowerShell)

Get-NetTCPConnection -LocalPort 2891 -State Listen | Select LocalAddress, OwningProcess
Get-NetUDPEndpoint -LocalPort 2891
netstat -ano | findstr :2891

From another machine

nmap -p 2891 -sV <host>
sudo nmap -sU -p 2891 <host>
nc -zv <host> 2891

Block it in the firewall

sudo ufw deny 2891/tcp                                         # Linux (ufw)
New-NetFirewallRule -DisplayName "Block 2891" -Direction Inbound -LocalPort 2891 -Protocol TCP -Action Block  # Windows
04 FAQ
What is port 2891 used for?

Port 2891 is assigned by IANA to cinegrfx-elmd (CINEGRFX-ELMD License Manager).

Is port 2891 TCP or UDP?

Port 2891 is registered for TCP and UDP.

Is it safe to open port 2891?

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 2891 is open?

On Linux run "ss -ltnup 'sport = :2891'", on macOS "lsof -nP -i :2891", and on Windows "netstat -ano | findstr :2891" to see the local process. From another machine, "nmap -p 2891 <host>" shows whether it is reachable.

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