---
type: lookup
id: orc-4f-52-43
asset: file-format-signatures
title: "4F 52 43 — File format magic numbers"
sources:
  - https://en.wikipedia.org/wiki/List_of_file_signatures
source_quote: "<https://en.wikipedia.org/wiki/Apache_ORC> Apache ORC (Optimized Row Columnar) file format"
generated: true
verified: false
harvested: 2026-08-03
stale_after: 2027-08-03
hex_signature: "4F 52 43"
offset: "0"
extension: "orc"
format: "Apache ORC (Optimized Row Columnar) file format"
unverified_fields: hex_signature, offset
---
**Hex signature:** 4F 52 43

**Offset:** 0

**Extension:** orc

**Format:** Apache ORC (Optimized Row Columnar) file format

> <https://en.wikipedia.org/wiki/Apache_ORC> Apache ORC (Optimized Row Columnar) file format

Source: <https://en.wikipedia.org/wiki/List_of_file_signatures>