UnfinalizedMeasurement Data Format (.mf4)
.mf4 file signature | application/octet-stream
Unfinalized Measurement Data Format (MF4) is a file format used by ASAM, the Association for Standardization of Automation and Measuring Systems, for storing measurement data in an unfinalized state. It is used in automotive and industrial testing to record sensor signals, event logs, and vehicle diagnostics during data acquisition. The format is generally safe, but unfinalized files may be incomplete or inconsistent because they are written while capture is still in progress.
Magic Bytes
Offset 0
55 6E 46 69 6E 4D 46
Sources: Gary Kessler
Extension
.mf4
MIME Type
application/octet-stream
Byte Offset
0
Risk Level
Safe
Validation Code
How to validate .mf4 files in Python
def is_mf4(file_path: str) -> bool:
"""Check if file is a valid MF4 by magic bytes."""
signature = bytes([0x55, 0x6E, 0x46, 0x69, 0x6E, 0x4D, 0x46])
with open(file_path, "rb") as f:
return f.read(7) == signatureHow to validate .mf4 files in Node.js
function isMF4(buffer: Buffer): boolean {
const signature = Buffer.from([0x55, 0x6E, 0x46, 0x69, 0x6E, 0x4D, 0x46]);
return buffer.subarray(0, 7).equals(signature);
}How to validate .mf4 files in Go
func IsMF4(data []byte) bool {
signature := []byte{0x55, 0x6E, 0x46, 0x69, 0x6E, 0x4D, 0x46}
if len(data) < 7 {
return false
}
return bytes.Equal(data[:7], signature)
}API Endpoint
/api/v1/mf4
curl https://filesignature.org/api/v1/mf4
See the full API documentation for all endpoints and parameters.
Frequently Asked Questions
What is a .mf4 file?
A .mf4 file is a UnfinalizedMeasurement Data Format file. Unfinalized Measurement Data Format (MF4) is a file format used by ASAM, the Association for Standardization of Automation and Measuring Systems, for storing measurement data in an unfinalized state. It is used in automotive and industrial testing to record sensor signals, event logs, and vehicle diagnostics during data acquisition. The format is generally safe, but unfinalized files may be incomplete or inconsistent because they are written while capture is still in progress.
What are the magic bytes for .mf4 files?
The magic bytes for UnfinalizedMeasurement Data Format files are 55 6E 46 69 6E 4D 46 at byte offset 0. These bytes uniquely identify the file format regardless of the file extension.
How do I validate a .mf4 file?
To validate a .mf4 file, read the first bytes of the file and compare them against the known magic bytes (55 6E 46 69 6E 4D 46) at offset 0. This is more reliable than checking the file extension alone, as extensions can be renamed.
What is the MIME type for .mf4 files?
There is no officially registered MIME type for .mf4 files. Systems typically use application/octet-stream as a generic fallback when handling this format.
Is it safe to open .mf4 files?
UnfinalizedMeasurement Data Format (.mf4) 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.