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threescan

The most powerful Minecraft server scanner in the world.

Usage

java -jar threescan.jar <type> <mode> <timeout> <rate> <name> <uniqueId>

where

  • type - the type of scan (simple, range, masscan, threescan)
  • mode - the mode of scan (fast, full)
  • timeout - the timeout of scan (in milliseconds)
  • rate - the rate of scan (scan per second)
  • name - the name of a player (used to determine server type)
  • uniqueId - the uniqueId of a player (used to determine server type)

It is highly encouraged to use this program with masscan on Linux for better performance.

It is known that this program may cause some issues on Windows.

In order to use this program with masscan, you can use the following command:

masscan -c masscan.conf 2>/dev/null | java -jar threescan.jar masscan stdin 200 2000 <username> <uuid> > output.txt 2>error.txt

where

  • masscan.conf - the configuration file of masscan
  • username - the name of a player (which will be shown to scanned hosts)
  • uuid - the uniqueId of a player (specify a UUID that matches to the username from https://namemc.com)

Features

  • zero memory copy
  • asynchronous I/O
  • ability to determine server type

Types

Currently, there are 4 types: "simple", "range", "masscan", and "threescan".

Simple

This type is used to scan a single host.

<host>
127.0.0.1
<host> <port>
127.0.0.1 25565
<host> <portStart> <portEnd>
127.0.0.1 25565 25565

Range

This type is used to scan a range of hosts.

<CIDR> <portStart> <portEnd>
127.0.0.1/24 25565 25565

<ipv4Start>-<ipv4End> <portStart> <portEnd>
127.0.0.1-127.0.0.255 25565 25565

<ipv4> <portStart> <portEnd>
127.0.0.1 25565 25565

Masscan

This type is used to combine the program with Masscan.

Discovered open port <port>/tcp on <ipv4>
Discovered open port 25565/tcp on 127.0.0.1

Threescan

This type is used to recheck the scan results of threescan.

{"host":"<host>", "port":<port>, ...}
{"host":"127.0.0.1", "port":25565, ...}

Modes

Currently, there are 2 modes: "fast" and "full".

With full mode, additional packets are sent to determine server types. However, scans will be slower and a message will be shown to scanned hosts.