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UTOC (.utoc)

.utoc file signature | application/octet-stream

Unreal EngineTable of Contents file

Safe

Magic Bytes

Offset 0
2D 3D 3D 2D 2D 3D 3D 2D 2D 3D 3D 2D 2D 3D 3D 2D

Sources: Wikipedia

Extension

.utoc

MIME Type

application/octet-stream

Byte Offset

0

Risk Level

Safe

Validation Code

How to validate .utoc files in Python

Python 
def is_utoc(file_path: str) -> bool:
    """Check if file is a valid UTOC by magic bytes."""
    signature = bytes([0x2D, 0x3D, 0x3D, 0x2D, 0x2D, 0x3D, 0x3D, 0x2D, 0x2D, 0x3D, 0x3D, 0x2D, 0x2D, 0x3D, 0x3D, 0x2D])
    with open(file_path, "rb") as f:
        return f.read(16) == signature

How to validate .utoc files in Node.js

Node.js 
function isUTOC(buffer: Buffer): boolean {
  const signature = Buffer.from([0x2D, 0x3D, 0x3D, 0x2D, 0x2D, 0x3D, 0x3D, 0x2D, 0x2D, 0x3D, 0x3D, 0x2D, 0x2D, 0x3D, 0x3D, 0x2D]);
  return buffer.subarray(0, 16).equals(signature);
}

How to validate .utoc files in Go

Go 
func IsUTOC(data []byte) bool {
    signature := []byte{0x2D, 0x3D, 0x3D, 0x2D, 0x2D, 0x3D, 0x3D, 0x2D, 0x2D, 0x3D, 0x3D, 0x2D, 0x2D, 0x3D, 0x3D, 0x2D}
    if len(data) < 16 {
        return false
    }
    return bytes.Equal(data[:16], signature)
}

API Endpoint

GET /api/v1/utoc
curl https://filesignature.org/api/v1/utoc

See the full API documentation for all endpoints and parameters.

Frequently Asked Questions

What is a .utoc file?

A .utoc file is a UTOC file. Unreal EngineTable of Contents file

What are the magic bytes for .utoc files?

The magic bytes for UTOC files are 2D 3D 3D 2D 2D 3D 3D 2D 2D 3D 3D 2D 2D 3D 3D 2D at byte offset 0. These bytes uniquely identify the file format regardless of the file extension.

How do I validate a .utoc file?

To validate a .utoc file, read the first bytes of the file and compare them against the known magic bytes (2D 3D 3D 2D 2D 3D 3D 2D 2D 3D 3D 2D 2D 3D 3D 2D) at offset 0. This is more reliable than checking the file extension alone, as extensions can be renamed.

What is the MIME type for .utoc files?

There is no officially registered MIME type for .utoc files. Systems typically use application/octet-stream as a generic fallback when handling this format.

Is it safe to open .utoc files?

UTOC (.utoc) files are generally safe to open. They are classified as low risk because they primarily contain data rather than executable code. However, always ensure files come from a trusted source.