# 46 4F 52 4D ?? ?? ?? ?? 49 4C 42 4D — File format magic numbers

For 46 4F 52 4D ?? ?? ?? ?? 49 4C 42 4D, offset is 0 any; extension is ilbm lbm ibm iff; format is IFF ILBM Interleaved Bitmap Image, recorded from its source on 2026-08-03.

- **Hex signature:** 46 4F 52 4D ?? ?? ?? ?? 49 4C 42 4D _(unconfirmed — we could not tie this to the quote below)_
- **Offset:** 0 any _(unconfirmed — we could not tie this to the quote below)_
- **Extension:** ilbm lbm ibm iff _(unconfirmed — we could not tie this to the quote below)_
- **Format:** IFF ILBM Interleaved Bitmap Image _(unconfirmed — we could not tie this to the quote below)_

## What the source says

> <https://en.wikipedia.org/wiki/Interchange_File_Format> IFF <https://en.wikipedia.org/wiki/ILBM> Interleaved Bitmap Image

## 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/).