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// Other services

Port 33334: SpeedTrace TraceAgent

Port 33334 is assigned by IANA to speedtrace (SpeedTrace TraceAgent), speedtrace-disc (SpeedTrace TraceAgent Discovery).

33334

How speedtrace works

Other services
client:33334speedtraceresponse client:33334speedtraceresponse

The client sends a request to port 33334 and the speedtrace service answers.

Transport
TCP · UDP
Exposure risk
not rated depends on the program listening
Encryption
Unknownnot stated by the registry
IANA status
Assigned2 registered services
Range
Registered (1024-49151)
Category
Other services
01 Security

Is port 33334 dangerous?

We have no specific security note for port 33334. 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 33334

ServicePortTransportDescriptionReferenceUpdated
speedtrace 33334 TCP SpeedTrace TraceAgent - 2012-02-01
speedtrace-disc 33334 UDP SpeedTrace TraceAgent Discovery - 2012-02-01

// source: IANA service name and port number registry

03 Check it

Which program uses port 33334, and is it reachable?

Linux

sudo ss -ltnup 'sport = :33334'      # process listening on 33334
sudo lsof -nP -i :33334

macOS

sudo lsof -nP -i :33334

Windows (PowerShell)

Get-NetTCPConnection -LocalPort 33334 -State Listen | Select LocalAddress, OwningProcess
Get-NetUDPEndpoint -LocalPort 33334
netstat -ano | findstr :33334

From another machine

nmap -p 33334 -sV <host>
sudo nmap -sU -p 33334 <host>
nc -zv <host> 33334

Block it in the firewall

sudo ufw deny 33334/tcp                                         # Linux (ufw)
New-NetFirewallRule -DisplayName "Block 33334" -Direction Inbound -LocalPort 33334 -Protocol TCP -Action Block  # Windows
04 FAQ
What is port 33334 used for?

Port 33334 is assigned by IANA to speedtrace (SpeedTrace TraceAgent), speedtrace-disc (SpeedTrace TraceAgent Discovery).

Is port 33334 TCP or UDP?

Port 33334 is registered for TCP and UDP.

Is it safe to open port 33334?

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 33334 is open?

On Linux run "ss -ltnup 'sport = :33334'", on macOS "lsof -nP -i :33334", and on Windows "netstat -ano | findstr :33334" to see the local process. From another machine, "nmap -p 33334 <host>" shows whether it is reachable.

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