CyberHunter
Local dataset, no network
// Other services

Port 3234: Alchemy Server

Port 3234 is assigned by IANA to alchemy (Alchemy Server).

3234

How alchemy works

Other services
client:3234alchemyresponse client:3234alchemyresponse

The client sends a request to port 3234 and the alchemy 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 3234 dangerous?

We have no specific security note for port 3234. 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 3234

ServicePortTransportDescriptionReferenceUpdated
alchemy 3234 TCP, UDP Alchemy Server - 2002-02

// source: IANA service name and port number registry

03 Check it

Which program uses port 3234, and is it reachable?

Linux

sudo ss -ltnup 'sport = :3234'      # process listening on 3234
sudo lsof -nP -i :3234

macOS

sudo lsof -nP -i :3234

Windows (PowerShell)

Get-NetTCPConnection -LocalPort 3234 -State Listen | Select LocalAddress, OwningProcess
Get-NetUDPEndpoint -LocalPort 3234
netstat -ano | findstr :3234

From another machine

nmap -p 3234 -sV <host>
sudo nmap -sU -p 3234 <host>
nc -zv <host> 3234

Block it in the firewall

sudo ufw deny 3234/tcp                                         # Linux (ufw)
New-NetFirewallRule -DisplayName "Block 3234" -Direction Inbound -LocalPort 3234 -Protocol TCP -Action Block  # Windows
04 FAQ
What is port 3234 used for?

Port 3234 is assigned by IANA to alchemy (Alchemy Server).

Is port 3234 TCP or UDP?

Port 3234 is registered for TCP and UDP.

Is it safe to open port 3234?

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 3234 is open?

On Linux run "ss -ltnup 'sport = :3234'", on macOS "lsof -nP -i :3234", and on Windows "netstat -ano | findstr :3234" to see the local process. From another machine, "nmap -p 3234 <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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