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GRIB2 (.grib2)

.grib2 file signature | application/octet-stream

Gridded data (commonly weather observations or forecasts) in theWMOGRIBorGRIB2format[89]

Safe

Magic Bytes

Offset 0
47 52 49 42

Sources: Wikipedia

Extension

.grib2

MIME Type

application/octet-stream

Byte Offset

0

Risk Level

Safe

Validation Code

How to validate .grib2 files in Python

Python 
def is_grib2(file_path: str) -> bool:
    """Check if file is a valid GRIB2 by magic bytes."""
    signature = bytes([0x47, 0x52, 0x49, 0x42])
    with open(file_path, "rb") as f:
        return f.read(4) == signature

How to validate .grib2 files in Node.js

Node.js 
function isGRIB2(buffer: Buffer): boolean {
  const signature = Buffer.from([0x47, 0x52, 0x49, 0x42]);
  return buffer.subarray(0, 4).equals(signature);
}

How to validate .grib2 files in Go

Go 
func IsGRIB2(data []byte) bool {
    signature := []byte{0x47, 0x52, 0x49, 0x42}
    if len(data) < 4 {
        return false
    }
    return bytes.Equal(data[:4], signature)
}

API Endpoint

GET /api/v1/grib2
curl https://filesignature.org/api/v1/grib2

See the full API documentation for all endpoints and parameters.

Frequently Asked Questions

What is a .grib2 file?

A .grib2 file is a GRIB2 file. Gridded data (commonly weather observations or forecasts) in theWMOGRIBorGRIB2format[89]

What are the magic bytes for .grib2 files?

The magic bytes for GRIB2 files are 47 52 49 42 at byte offset 0. These bytes uniquely identify the file format regardless of the file extension.

How do I validate a .grib2 file?

To validate a .grib2 file, read the first bytes of the file and compare them against the known magic bytes (47 52 49 42) at offset 0. This is more reliable than checking the file extension alone, as extensions can be renamed.

What is the MIME type for .grib2 files?

There is no officially registered MIME type for .grib2 files. Systems typically use application/octet-stream as a generic fallback when handling this format.

Is it safe to open .grib2 files?

GRIB2 (.grib2) 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.