> For the complete documentation index, see [llms.txt](https://docs.gutenbricks.com/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://docs.gutenbricks.com/resources/developer-api/unique-ids.md).

# Unique IDs

Since RC 4, (tested under RC3.7.x) all the blocks generated by GutenBricks will have unique IDs. A unique ID is made of a combination of the Bricks Builder's original ID and a block ID generated when the user inserts a new block:

Example:

```
// Bricks Builder ID
brxe-8e9775

// GutenBricks ID with a block ID as a suffix to ensure uniqueness 
b-8e9775_ls8i5k7o 
```

<figure><img src="/files/P3dRzJDPb1zwOMrGLexM" alt=""><figcaption><p>Here a same template rendered 6 times.</p></figcaption></figure>

Note: the prefix "brxe" is replaced with "b-" to reduce the length of ID.