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// Other services

Port 33434: traceroute use

Port 33434 is assigned by IANA to traceroute (traceroute use).

33434

How traceroute works

Other services
client:33434tracerouteresponse client:33434tracerouteresponse

The client sends a request to port 33434 and the traceroute 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 33434 dangerous?

We have no specific security note for port 33434. 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 33434

ServicePortTransportDescriptionReferenceUpdated
traceroute 33434 TCP, UDP traceroute use - -

// source: IANA service name and port number registry

03 Check it

Which program uses port 33434, and is it reachable?

Linux

sudo ss -ltnup 'sport = :33434'      # process listening on 33434
sudo lsof -nP -i :33434

macOS

sudo lsof -nP -i :33434

Windows (PowerShell)

Get-NetTCPConnection -LocalPort 33434 -State Listen | Select LocalAddress, OwningProcess
Get-NetUDPEndpoint -LocalPort 33434
netstat -ano | findstr :33434

From another machine

nmap -p 33434 -sV <host>
sudo nmap -sU -p 33434 <host>
nc -zv <host> 33434

Block it in the firewall

sudo ufw deny 33434/tcp                                         # Linux (ufw)
New-NetFirewallRule -DisplayName "Block 33434" -Direction Inbound -LocalPort 33434 -Protocol TCP -Action Block  # Windows
04 FAQ
What is port 33434 used for?

Port 33434 is assigned by IANA to traceroute (traceroute use).

Is port 33434 TCP or UDP?

Port 33434 is registered for TCP and UDP.

Is it safe to open port 33434?

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 33434 is open?

On Linux run "ss -ltnup 'sport = :33434'", on macOS "lsof -nP -i :33434", and on Windows "netstat -ano | findstr :33434" to see the local process. From another machine, "nmap -p 33434 <host>" shows whether it is reachable.

05 Related
:4444 Metasploit default / krb524 tcp · udp · high risk :31337 Back Orifice / elite tcp · udp · high risk :1 TCP Port Service Multiplexer tcp · udp :5 Remote Job Entry tcp · udp :9 Discard tcp · udp · sctp · dccp :11 Active Users tcp · udp :17 Quote of the Day tcp · udp :18 Message Send Protocol (historic) tcp · udp

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