# 66 74 79 70 33 67 — File format magic numbers

For 66 74 79 70 33 67, offset is 4; extension is 3gp 3g2; format is 3rd Generation Partnership Project 3GPP and 3GPP2 multimedia files, recorded from its source on 2026-08-03.

- **Hex signature:** 66 74 79 70 33 67 _(unconfirmed — we could not tie this to the quote below)_
- **Offset:** 4 _(unconfirmed — we could not tie this to the quote below)_
- **Extension:** 3gp 3g2 _(unconfirmed — we could not tie this to the quote below)_
- **Format:** 3rd Generation Partnership Project 3GPP and 3GPP2 multimedia files

## What the source says

> 3rd Generation Partnership Project <https://en.wikipedia.org/wiki/3GPP> 3GPP and <https://en.wikipedia.org/wiki/3GPP2> 3GPP2 multimedia files

## 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/).