Firebird and Interbase database files magic bytes (.fdb)
.fdb file signature: 01 00 39 30 | application/octet-stream
Category: Databases
The Firebird and InterBase database file format is a relational database file format developed for and maintained by the Firebird Project and Embarcadero Technologies, respectively. This format stores application data for embedded and client-server databases used in business systems, desktop applications, and legacy InterBase deployments. Because it contains structured data rather than executable content, it is generally safe to handle, though database access should still be controlled.
Magic Bytes
Offset 0
01 00 39 30
Sources: Gary Kessler
All Known Signatures
2 signature variants are documented for .fdb files across multiple sources.
| Hex Signature | Offset | Sources |
|---|---|---|
| 01 00 39 30 | 0 | Gary Kessler |
| 46 44 42 48 00 | 0 | Gary Kessler |
Validation Code
How to validate .fdb files in Python
def is_fdb(file_path: str) -> bool:
"""Check if file is a valid FDB by magic bytes."""
signature = bytes([0x01, 0x00, 0x39, 0x30])
with open(file_path, "rb") as f:
return f.read(4) == signatureHow to validate .fdb files in Node.js
function isFDB(buffer: Buffer): boolean {
const signature = Buffer.from([0x01, 0x00, 0x39, 0x30]);
return buffer.subarray(0, 4).equals(signature);
}How to validate .fdb files in Go
func IsFDB(data []byte) bool {
signature := []byte{0x01, 0x00, 0x39, 0x30}
if len(data) < 4 {
return false
}
return bytes.Equal(data[:4], signature)
}API Endpoint
/api/v1/fdb
curl https://filesignature.org/api/v1/fdb
See the full API documentation for all endpoints and parameters.
Related Formats
Frequently Asked Questions
What is a .fdb file?
A .fdb file is a Firebird and Interbase database files. The Firebird and InterBase database file format is a relational database file format developed for and maintained by the Firebird Project and Embarcadero Technologies, respectively. This format stores application data for embedded and client-server databases used in business systems, desktop applications, and legacy InterBase deployments. Because it contains structured data rather than executable content, it is generally safe to handle, though database access should still be controlled.
What are the magic bytes for .fdb files?
The magic bytes for Firebird and Interbase database files (.fdb) files are 01 00 39 30 at byte offset 0. These bytes identify the file format more reliably than the extension alone.
How do I validate a .fdb file?
To validate a .fdb file, read the first bytes of the file and compare them against the known magic bytes (01 00 39 30) at offset 0. This is more reliable than checking the file extension alone, as extensions can be renamed.
What is the MIME type for .fdb files?
There is no officially registered MIME type for .fdb files. Systems typically use application/octet-stream as a generic fallback when handling this format.
Is it safe to open .fdb files?
Firebird and Interbase database files (.fdb) 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.