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0xCAFEBABE

Java class file / Mach-O fat binary

category

file-signature

normalized

cafebabe

confirmed

2026-05-12

lookups

1

source

https://docs.oracle.com/javase/specs/jvms/se21/html/jvms-4.html

Magic number at the start of every compiled Java .class file, chosen by James Gosling. The same value marks multi-architecture ("fat") Mach-O binaries on macOS.