# CA FE BA BE — File format magic numbers

For CA FE BA BE, offset is 0; extension is class; format is <https://en.wikipedia.org/wiki/Java_class_file> Java class file , <https://en.wikipedia.org/wiki/Fat_binary#Apple> Mach-O Fat Binary, recorded from its source on 2026-08-03.

- **Hex signature:** CA FE BA BE _(unconfirmed — we could not tie this to the quote below)_
- **Offset:** 0 _(unconfirmed — we could not tie this to the quote below)_
- **Extension:** class
- **Format:** <https://en.wikipedia.org/wiki/Java_class_file> Java class file , <https://en.wikipedia.org/wiki/Fat_binary#Apple> Mach-O Fat Binary

## What the source says

> <https://en.wikipedia.org/wiki/Java_class_file> Java class file , <https://en.wikipedia.org/wiki/Fat_binary#Apple> Mach-O Fat Binary

## Source

- https://en.wikipedia.org/wiki/List_of_file_signatures

Last verified: 2026-08-03. Review by: 2027-08-03.
Part of [File format magic numbers](https://referencesource.org/file-format-signatures/).