# ISO9660 CD/DVD image file — file signature 43 44 30 30 31 at offset 0x8001 0x8801 0x9001

For ISO9660 CD/DVD image file, hex signature is 43 44 30 30 31; offset is 0x8001 0x8801 0x9001; extension is iso, verified against its source on 2026-09-22.

- **Hex signature:** 43 44 30 30 31 _(verified: appears in the quote below)_
- **Offset:** 0x8001 0x8801 0x9001 _(verified: appears in the quote below)_
- **Extension:** iso _(verified: appears in the quote below)_
- **Format:** ISO9660 CD/DVD image file _(verified: appears in the quote below)_

## What the source says

> 43 44 30 30 31 | CD001 | 0x8001 0x8801 0x9001 | iso | ISO9660 CD/DVD image file [40] |

## 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/).