GRIB (.grib)
.grib file signature | application/octet-stream
GRIB is a binary file format for gridded meteorological data, created and maintained by the World Meteorological Organization (WMO). It is used to distribute weather model outputs, forecasts, and observational data in applications such as forecasting systems, climate research, and numerical weather prediction. The format is considered low risk; it generally contains data only and has no known security concerns beyond the usual need to validate untrusted files.
Magic Bytes
Offset 0
47 52 49 42
Sources: Wikipedia
Extension
.grib
MIME Type
application/octet-stream
Byte Offset
0
Risk Level
Safe
Validation Code
How to validate .grib files in Python
def is_grib(file_path: str) -> bool:
"""Check if file is a valid GRIB by magic bytes."""
signature = bytes([0x47, 0x52, 0x49, 0x42])
with open(file_path, "rb") as f:
return f.read(4) == signatureHow to validate .grib files in Node.js
function isGRIB(buffer: Buffer): boolean {
const signature = Buffer.from([0x47, 0x52, 0x49, 0x42]);
return buffer.subarray(0, 4).equals(signature);
}How to validate .grib files in Go
func IsGRIB(data []byte) bool {
signature := []byte{0x47, 0x52, 0x49, 0x42}
if len(data) < 4 {
return false
}
return bytes.Equal(data[:4], signature)
}API Endpoint
/api/v1/grib
curl https://filesignature.org/api/v1/grib
See the full API documentation for all endpoints and parameters.
Related Formats
Frequently Asked Questions
What is a .grib file?
A .grib file is identified by the magic bytes 47 52 49 42 at byte offset 0. GRIB is a binary file format for gridded meteorological data, created and maintained by the World Meteorological Organization (WMO). It is used to distribute weather model outputs, forecasts, and observational data in applications such as forecasting systems, climate research, and numerical weather prediction. The format is considered low risk; it generally contains data only and has no known security concerns beyond the usual need to validate untrusted files.
What are the magic bytes for .grib files?
The magic bytes for GRIB 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 .grib file?
To validate a .grib 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 .grib files?
There is no officially registered MIME type for .grib files. Systems typically use application/octet-stream as a generic fallback when handling this format.
Is it safe to open .grib files?
GRIB (.grib) 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.