CyberHunter
Local dataset, no network
// Other services

Port 3554: Quest Notification Server

Port 3554 is assigned by IANA to questnotify (Quest Notification Server).

3554

How questnotify works

Other services
client:3554questnotifyresponse client:3554questnotifyresponse

The client sends a request to port 3554 and the questnotify 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 3554 dangerous?

We have no specific security note for port 3554. 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 3554

ServicePortTransportDescriptionReferenceUpdated
questnotify 3554 TCP, UDP Quest Notification Server - 2002-07

// source: IANA service name and port number registry

03 Check it

Which program uses port 3554, and is it reachable?

Linux

sudo ss -ltnup 'sport = :3554'      # process listening on 3554
sudo lsof -nP -i :3554

macOS

sudo lsof -nP -i :3554

Windows (PowerShell)

Get-NetTCPConnection -LocalPort 3554 -State Listen | Select LocalAddress, OwningProcess
Get-NetUDPEndpoint -LocalPort 3554
netstat -ano | findstr :3554

From another machine

nmap -p 3554 -sV <host>
sudo nmap -sU -p 3554 <host>
nc -zv <host> 3554

Block it in the firewall

sudo ufw deny 3554/tcp                                         # Linux (ufw)
New-NetFirewallRule -DisplayName "Block 3554" -Direction Inbound -LocalPort 3554 -Protocol TCP -Action Block  # Windows
04 FAQ
What is port 3554 used for?

Port 3554 is assigned by IANA to questnotify (Quest Notification Server).

Is port 3554 TCP or UDP?

Port 3554 is registered for TCP and UDP.

Is it safe to open port 3554?

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 3554 is open?

On Linux run "ss -ltnup 'sport = :3554'", on macOS "lsof -nP -i :3554", and on Windows "netstat -ano | findstr :3554" to see the local process. From another machine, "nmap -p 3554 <host>" shows whether it is reachable.

05 Related
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