3G2
video/3gpp2
Magic Bytes
Offset: 4
66 74 79 70 33 67 32 61
The 3GPP2 Multimedia File Format (3G2) is a container standard developed by the 3rd Generation Partnership Project 2 for multimedia services on CDMA cellular networks. It was specifically designed for capturing and transmitting audio and video content via the Multimedia Messaging Service on early mobile devices. Although now considered a legacy format superseded by MP4, it is frequently encountered during digital forensic analysis and the archival of media from older mobile hardware.
Validation Code
How to validate .3g2 files in Python
Python
def is_3g2(file_path: str) -> bool:
"""
Check if file is a valid 3G2 by magic bytes.
Signature offset: 4 bytes
"""
signature = bytes([0x66, 0x74, 0x79, 0x70, 0x33, 0x67, 0x32, 0x61])
with open(file_path, "rb") as f:
f.seek(4)
return f.read(8) == signatureHow to validate .3g2 files in Node.js
Node.js
function is3G2(buffer: Buffer): boolean {
// Signature offset: 4 bytes
const signature = Buffer.from([0x66, 0x74, 0x79, 0x70, 0x33, 0x67, 0x32, 0x61]);
if (buffer.length < 12) return false;
return buffer.subarray(4, 12).equals(signature);
}
Go
func Is3G2(data []byte) bool {
// Signature offset: 4 bytes
signature := []byte{0x66, 0x74, 0x79, 0x70, 0x33, 0x67, 0x32, 0x61}
if len(data) < 12 {
return false
}
return bytes.Equal(data[4:12], signature)
}API Endpoint
GET
/api/v1/3g2
curl https://filesignature.org/api/v1/3g2