AOL history (.aut)
.aut file signature | application/octet-stream
AOL history (AUT) is a legacy file format created and used by America Online (AOL) to store browsing history data associated with its software. It was used to record typed URLs and related activity for AOL clients, primarily for local history and user convenience features. The format is obsolete and generally safe, though files from older systems may contain private browsing records and should be handled with normal privacy care.
Magic Bytes
Offset 0
D4 2A
Sources: Gary Kessler
Extension
.aut
MIME Type
application/octet-stream
Byte Offset
0
Risk Level
Safe
Validation Code
How to validate .aut files in Python
def is_aut(file_path: str) -> bool:
"""Check if file is a valid AUT by magic bytes."""
signature = bytes([0xD4, 0x2A])
with open(file_path, "rb") as f:
return f.read(2) == signatureHow to validate .aut files in Node.js
function isAUT(buffer: Buffer): boolean {
const signature = Buffer.from([0xD4, 0x2A]);
return buffer.subarray(0, 2).equals(signature);
}How to validate .aut files in Go
func IsAUT(data []byte) bool {
signature := []byte{0xD4, 0x2A}
if len(data) < 2 {
return false
}
return bytes.Equal(data[:2], signature)
}API Endpoint
/api/v1/aut
curl https://filesignature.org/api/v1/aut
See the full API documentation for all endpoints and parameters.
Related Formats
Frequently Asked Questions
What is a .aut file?
A .aut file is a AOL history file. AOL history (AUT) is a legacy file format created and used by America Online (AOL) to store browsing history data associated with its software. It was used to record typed URLs and related activity for AOL clients, primarily for local history and user convenience features. The format is obsolete and generally safe, though files from older systems may contain private browsing records and should be handled with normal privacy care.
What are the magic bytes for .aut files?
The magic bytes for AOL history files are D4 2A at byte offset 0. These bytes uniquely identify the file format regardless of the file extension.
How do I validate a .aut file?
To validate a .aut file, read the first bytes of the file and compare them against the known magic bytes (D4 2A) at offset 0. This is more reliable than checking the file extension alone, as extensions can be renamed.
What is the MIME type for .aut files?
There is no officially registered MIME type for .aut files. Systems typically use application/octet-stream as a generic fallback when handling this format.
Is it safe to open .aut files?
AOL history (.aut) 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.