There are 2 repositories under magic-number topic.
Crate for determining the file format of a given file or stream
A MIME type sniffer for Go.
File Type Checker is a .Net file identification library allowing developers to verify the file's magic numbers/identifying bytes against a whitelist.
SixArm.com » Ruby » MagicNumberType infers a data type from the data's leading bytes
Infer file and MIME type by checking the magic number signature
The magic number 0x5F3759DF in Python3 Fast Inverse SquareRoot
.NET File header validator against received file extension
The magic number
The library for detecting the type of file based on file header signature (magic number). Implementation for .NET Standard 2.0.
This repository contains a replica of Miller Magic Number experiment
Inspect the HTTP cache of browsers or online game clients and preview image or audio assets of different formats using their file signatures.