# 44 55 43 4b — File format magic numbers

For 44 55 43 4b, offset is 8; extension is duck; format is DuckDB database file, verified against its source on 2026-08-03.

- **Hex signature:** 44 55 43 4b
- **Offset:** 8
- **Extension:** duck
- **Format:** DuckDB database file

## What the source says

> 44 55 43 4b | DUCK | 8 | | <https://en.wikipedia.org/wiki/DuckDB> DuckDB database file (source: <https://github.com/duckdb/duckdb/blob/main/src/include/duckdb/storage/storage_info.hpp#L69> Source code ) |

## 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/).