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Resource Interchange File Format -- Compact Disc DigitalAudio (.cda)

.cda file signature | application/octet-stream

Resource Interchange File Format -- Compact Disc DigitalAudio (CD-DA) file, wherexx xx xx xxis the file size (little endian)

Safe

Magic Bytes

Offset 0
52 49 46 46 43 44 44 41

Sources: Wikipedia

All Known Signatures

2 signature variants are documented for .cda files across multiple sources.

Hex Signature Offset Sources
52 49 46 46 43 44 44 41 0 Wikipedia
52 49 46 46 43 44 44 41 66 6D 74 20 0 Gary Kessler

Extension

.cda

MIME Type

application/octet-stream

Byte Offset

0

Risk Level

Safe

Validation Code

How to validate .cda files in Python

Python 
def is_cda(file_path: str) -> bool:
    """Check if file is a valid CDA by magic bytes."""
    signature = bytes([0x52, 0x49, 0x46, 0x46, 0x43, 0x44, 0x44, 0x41])
    with open(file_path, "rb") as f:
        return f.read(8) == signature

How to validate .cda files in Node.js

Node.js 
function isCDA(buffer: Buffer): boolean {
  const signature = Buffer.from([0x52, 0x49, 0x46, 0x46, 0x43, 0x44, 0x44, 0x41]);
  return buffer.subarray(0, 8).equals(signature);
}

How to validate .cda files in Go

Go 
func IsCDA(data []byte) bool {
    signature := []byte{0x52, 0x49, 0x46, 0x46, 0x43, 0x44, 0x44, 0x41}
    if len(data) < 8 {
        return false
    }
    return bytes.Equal(data[:8], signature)
}

API Endpoint

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

See the full API documentation for all endpoints and parameters.

Frequently Asked Questions

What is a .cda file?

A .cda file is a Resource Interchange File Format -- Compact Disc DigitalAudio file. Resource Interchange File Format -- Compact Disc DigitalAudio (CD-DA) file, wherexx xx xx xxis the file size (little endian)

What are the magic bytes for .cda files?

The magic bytes for Resource Interchange File Format -- Compact Disc DigitalAudio files are 52 49 46 46 43 44 44 41 at byte offset 0. These bytes uniquely identify the file format regardless of the file extension.

How do I validate a .cda file?

To validate a .cda file, read the first bytes of the file and compare them against the known magic bytes (52 49 46 46 43 44 44 41) at offset 0. This is more reliable than checking the file extension alone, as extensions can be renamed.

What is the MIME type for .cda files?

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

Is it safe to open .cda files?

Resource Interchange File Format -- Compact Disc DigitalAudio (.cda) 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.