# 50 4B 03 04 50 4B 05 06 (empty archive) 50 4B 07 08 (spanned archive) — File format magic numbers

For 50 4B 03 04 50 4B 05 06 (empty archive) 50 4B 07 08 (spanned archive), offset is 0; extension is zip; format is zip file format, recorded from its source on 2026-08-03.

- **Hex signature:** 50 4B 03 04 50 4B 05 06 (empty archive) 50 4B 07 08 (spanned archive) _(unconfirmed — we could not tie this to the quote below)_
- **Offset:** 0
- **Extension:** zip
- **Format:** zip file format

## What the source says

> PK␃␄ PK␅␆ PK␇␈ | 0 | zip aar apk docx epub <https://en.wikipedia.org/wiki/.ipa> ipa jar kmz <https://en.wikipedia.org/wiki/Mozilla_Archive_Format> maff msix odp ods odt pk3 pk4 pptx usdz vsdx xlsx <https://en.wikipedia.org/wiki/XPInstall> xpi whl | <https://en.wikipedia.org/wiki/ZIP_(file_format)> zip file format and formats based on it, such as <https://en.wikipedia.org/wiki/EPUB> EPUB , <https://en.wikipedia.org/wiki/JAR_(file_format)> JAR , <https://en.wikipedia.org/wiki/OpenDocument> ODF , <https://en.wikipedia.org/wiki/Office_Open_XML> OOXML

## 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/).