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GRB1 (.grb1)

.grb1 file signature | application/x-grib

Safe

Magic Bytes

Offset 0
47 52 49 42

Sources: Apache Tika

Extension

.grb1

MIME Type

application/x-grib

Byte Offset

0

Risk Level

Safe

Validation Code

How to validate .grb1 files in Python

Python 
def is_grb1(file_path: str) -> bool:
    """Check if file is a valid GRB1 by magic bytes."""
    signature = bytes([0x47, 0x52, 0x49, 0x42])
    with open(file_path, "rb") as f:
        return f.read(4) == signature

How to validate .grb1 files in Node.js

Node.js 
function isGRB1(buffer: Buffer): boolean {
  const signature = Buffer.from([0x47, 0x52, 0x49, 0x42]);
  return buffer.subarray(0, 4).equals(signature);
}

How to validate .grb1 files in Go

Go 
func IsGRB1(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/grb1
curl https://filesignature.org/api/v1/grb1

See the full API documentation for all endpoints and parameters.

Frequently Asked Questions

What is a .grb1 file?

A .grb1 file is a GRB1 file.

What are the magic bytes for .grb1 files?

The magic bytes for GRB1 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 .grb1 file?

To validate a .grb1 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 .grb1 files?

The primary MIME type for .grb1 files is application/x-grib.

Is it safe to open .grb1 files?

GRB1 (.grb1) 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.