# internal WAD (main resource file of Doom) — file signature 49 57 41 44 at offset 0

For internal WAD (main resource file of Doom), hex signature is 49 57 41 44; offset is 0; extension is wad, verified against its source on 2026-09-22.

- **Hex signature:** 49 57 41 44 _(verified: appears in the quote below)_
- **Offset:** 0 _(verified: appears in the quote below)_
- **Extension:** wad _(verified: appears in the quote below)_
- **Format:** internal WAD (main resource file of Doom) _(verified: appears in the quote below)_

## What the source says

> 49 57 41 44 | IWAD | 0 | wad | internal WAD (main resource file of Doom) [7] |

## Source

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

Last verified: 2026-09-22. Review by: 2027-09-22.
Part of [File format magic numbers](https://referencesource.org/file-format-signatures/).