CyberHunter
Local dataset, no network
// Other services

Port 284: corerjd

Port 284 is assigned by IANA to corerjd (corerjd).

284

How corerjd works

Other services
client:284corerjdresponse client:284corerjdresponse

The client sends a request to port 284 and the corerjd 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
Well-known (0-1023)
Category
Other services
01 Security

Is port 284 dangerous?

We have no specific security note for port 284. 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 284

ServicePortTransportDescriptionReferenceUpdated
corerjd 284 TCP, UDP corerjd - -

// source: IANA service name and port number registry

03 Check it

Which program uses port 284, and is it reachable?

Linux

sudo ss -ltnup 'sport = :284'      # process listening on 284
sudo lsof -nP -i :284

macOS

sudo lsof -nP -i :284

Windows (PowerShell)

Get-NetTCPConnection -LocalPort 284 -State Listen | Select LocalAddress, OwningProcess
Get-NetUDPEndpoint -LocalPort 284
netstat -ano | findstr :284

From another machine

nmap -p 284 -sV <host>
sudo nmap -sU -p 284 <host>
nc -zv <host> 284

Block it in the firewall

sudo ufw deny 284/tcp                                         # Linux (ufw)
New-NetFirewallRule -DisplayName "Block 284" -Direction Inbound -LocalPort 284 -Protocol TCP -Action Block  # Windows
04 FAQ
What is port 284 used for?

Port 284 is assigned by IANA to corerjd (corerjd).

Is port 284 TCP or UDP?

Port 284 is registered for TCP and UDP.

Is it safe to open port 284?

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 284 is open?

On Linux run "ss -ltnup 'sport = :284'", on macOS "lsof -nP -i :284", and on Windows "netstat -ano | findstr :284" to see the local process. From another machine, "nmap -p 284 <host>" shows whether it is reachable.

05 Related
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