AU Codex (au-codex.com) is the definitive directory for official Australian statistical and regulatory classifications. Browse complete hierarchies for OSCA 2024 (the updated standard replacing ANZSCO), ANZSIC 2006 Rev. 2.0 (Divisions A through S, subdivisions, groups, and classes), ASCL language codes, ASCCEG ethnic groups, and AHECC 8-digit customs export codes for Australian businesses, researchers, and trade compliance.