> ## Documentation Index
> Fetch the complete documentation index at: https://mkbrr.com/llms.txt
> Use this file to discover all available pages before exploring further.

# Tracker rules

> mkbrr includes built-in knowledge about the specific requirements of various private trackers to help ensure the torrents you create are compliant. When you provide a tracker URL (`-t` flag or via presets/batch), `mkbrr` checks if it matches a known tracker and applies relevant rules automatically.

<Note>
  mkbrr automatically detects tracker requirements based on the announce URL and applies the appropriate rules to ensure your torrents are compliant.
</Note>

## How it Works

When creating a torrent, `mkbrr` compares the provided tracker URL against an internal list of configurations. If a match is found, it applies the corresponding rules:

<CardGroup cols={3}>
  <Card title="Piece Length" icon="puzzle-piece">
    Enforces maximum piece size limits specific to each tracker (e.g., 16 MiB, 8 MiB).
  </Card>

  <Card title="Size Ranges" icon="ruler">
    Selects optimal piece sizes based on content size using tracker-specific guidelines.
  </Card>

  <Card title="File Size" icon="file">
    Ensures the .torrent file stays within tracker size limits by adjusting piece length.
  </Card>
</CardGroup>

<Warning>
  Tracker-specific rules override manual settings (`-l` or `-m` flags) to ensure compliance. mkbrr always prioritizes tracker requirements.
</Warning>

## Implemented Trackers

Below is a list of implemented trackers and their specific requirements:

<Info>
  The tracker rules are maintained in the [mkbrr source code](https://github.com/autobrr/mkbrr/blob/main/internal/trackers/trackers.go). Contributions to keep rules updated are welcome via pull requests.
</Info>

| Tracker      | Piece Ranges | Max Piece Size | Max Torrent Size | Default Source   |
| ------------ | ------------ | -------------- | ---------------- | ---------------- |
| ANT          | Default      | -              | 250 KiB          | ANT              |
| NBL          | Default      | -              | 1 MiB            | NBL              |
| HDB          | Default      | 16 MiB         | -                | -                |
| SBS          | Default      | 16 MiB         | -                | -                |
| SP           | Default      | 16 MiB         | -                | -                |
| BHD          | Default      | 16 MiB         | -                | BHD              |
| PTP          | Custom       | 16 MiB         | -                | PTP              |
| MTV          | Default      | 8 MiB          | -                | MTV              |
| EMP          | Default      | 8 MiB          | -                | Emp              |
| GGN          | Custom       | 64 MiB         | 1 MiB            | GGn              |
| AlphaRatio   | Custom       | 64 MiB         | 2 MiB            | AlphaRatio       |
| seedpool.org | Custom       | 128 MiB        | -                | seedpool.org     |
| NB           | Custom       | 16 MiB         | -                | -                |
| BTN          | Custom       | 16 MiB         | -                | -                |
| TSYNDIKAT    | Custom       | 16 MiB         | -                | -                |
| OE           | Custom       | 16 MiB         | -                | -                |
| lst.gg       | Custom       | 16 MiB         | -                | lst.gg           |
| Aither       | Custom       | 128 MiB        | -                | Aither           |
| ULCX         | Default      | -              | -                | ULCX             |
| CapybaraBR   | Default      | -              | -                | CapybaraBR       |
| HUNO         | Default      | -              | -                | HUNO             |
| TorrentLeech | Custom       | 128 MiB        | -                | TorrentLeech.org |