IBM (.ibm)
.ibm file signature | application/octet-stream
Interleaved Bitmap (IBM) is a legacy raster image format from the Interchange File Format family, originally developed by Electronic Arts for Amiga systems. It was used to store bitmap graphics for early multimedia software, games, and desktop publishing workflows. The format is largely obsolete today, and while simple bitmap data poses limited security risk, older decoders should still be used cautiously with untrusted files.
Magic Bytes
Offset 0
46 4F 52 4D
Sources: Wikipedia
All Known Signatures
2 signature variants are documented for .ibm files across multiple sources.
Extension
.ibm
MIME Type
application/octet-stream
Byte Offset
0
Risk Level
Safe
Validation Code
How to validate .ibm files in Python
def is_ibm(file_path: str) -> bool:
"""Check if file is a valid IBM by magic bytes."""
signature = bytes([0x46, 0x4F, 0x52, 0x4D])
with open(file_path, "rb") as f:
return f.read(4) == signatureHow to validate .ibm files in Node.js
function isIBM(buffer: Buffer): boolean {
const signature = Buffer.from([0x46, 0x4F, 0x52, 0x4D]);
return buffer.subarray(0, 4).equals(signature);
}How to validate .ibm files in Go
func IsIBM(data []byte) bool {
signature := []byte{0x46, 0x4F, 0x52, 0x4D}
if len(data) < 4 {
return false
}
return bytes.Equal(data[:4], signature)
}API Endpoint
/api/v1/ibm
curl https://filesignature.org/api/v1/ibm
See the full API documentation for all endpoints and parameters.
Frequently Asked Questions
What is a .ibm file?
A .ibm file is identified by the magic bytes 46 4F 52 4D at byte offset 0. Interleaved Bitmap (IBM) is a legacy raster image format from the Interchange File Format family, originally developed by Electronic Arts for Amiga systems. It was used to store bitmap graphics for early multimedia software, games, and desktop publishing workflows. The format is largely obsolete today, and while simple bitmap data poses limited security risk, older decoders should still be used cautiously with untrusted files.
What are the magic bytes for .ibm files?
The magic bytes for IBM files are 46 4F 52 4D at byte offset 0. These bytes uniquely identify the file format regardless of the file extension.
How do I validate a .ibm file?
To validate a .ibm file, read the first bytes of the file and compare them against the known magic bytes (46 4F 52 4D) at offset 0. This is more reliable than checking the file extension alone, as extensions can be renamed.
What is the MIME type for .ibm files?
There is no officially registered MIME type for .ibm files. Systems typically use application/octet-stream as a generic fallback when handling this format.
Is it safe to open .ibm files?
IBM (.ibm) 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.