CyberHunter
Local dataset, no network
// Other services

Port 2289: Lookup dict server

Port 2289 is assigned by IANA to dict-lookup (Lookup dict server).

2289

How dict-lookup works

Other services
client:2289dict-lookupresponse client:2289dict-lookupresponse

The client sends a request to port 2289 and the dict-lookup 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 2289 dangerous?

We have no specific security note for port 2289. 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 2289

ServicePortTransportDescriptionReferenceUpdated
dict-lookup 2289 TCP, UDP Lookup dict server - 2005-01

// source: IANA service name and port number registry

03 Check it

Which program uses port 2289, and is it reachable?

Linux

sudo ss -ltnup 'sport = :2289'      # process listening on 2289
sudo lsof -nP -i :2289

macOS

sudo lsof -nP -i :2289

Windows (PowerShell)

Get-NetTCPConnection -LocalPort 2289 -State Listen | Select LocalAddress, OwningProcess
Get-NetUDPEndpoint -LocalPort 2289
netstat -ano | findstr :2289

From another machine

nmap -p 2289 -sV <host>
sudo nmap -sU -p 2289 <host>
nc -zv <host> 2289

Block it in the firewall

sudo ufw deny 2289/tcp                                         # Linux (ufw)
New-NetFirewallRule -DisplayName "Block 2289" -Direction Inbound -LocalPort 2289 -Protocol TCP -Action Block  # Windows
04 FAQ
What is port 2289 used for?

Port 2289 is assigned by IANA to dict-lookup (Lookup dict server).

Is port 2289 TCP or UDP?

Port 2289 is registered for TCP and UDP.

Is it safe to open port 2289?

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 2289 is open?

On Linux run "ss -ltnup 'sport = :2289'", on macOS "lsof -nP -i :2289", and on Windows "netstat -ano | findstr :2289" to see the local process. From another machine, "nmap -p 2289 <host>" shows whether it is reachable.

05 Related
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