Dial-up networking file (.dun)
.dun file signature | application/octet-stream
Dial-up networking file
Magic Bytes
Offset 0
5B 50 68 6F 6E 65 5D
Sources: Gary Kessler
Extension
.dun
MIME Type
application/octet-stream
Byte Offset
0
Risk Level
Safe
Validation Code
How to validate .dun files in Python
def is_dun(file_path: str) -> bool:
"""Check if file is a valid DUN by magic bytes."""
signature = bytes([0x5B, 0x50, 0x68, 0x6F, 0x6E, 0x65, 0x5D])
with open(file_path, "rb") as f:
return f.read(7) == signatureHow to validate .dun files in Node.js
function isDUN(buffer: Buffer): boolean {
const signature = Buffer.from([0x5B, 0x50, 0x68, 0x6F, 0x6E, 0x65, 0x5D]);
return buffer.subarray(0, 7).equals(signature);
}How to validate .dun files in Go
func IsDUN(data []byte) bool {
signature := []byte{0x5B, 0x50, 0x68, 0x6F, 0x6E, 0x65, 0x5D}
if len(data) < 7 {
return false
}
return bytes.Equal(data[:7], signature)
}API Endpoint
/api/v1/dun
curl https://filesignature.org/api/v1/dun
See the full API documentation for all endpoints and parameters.
Frequently Asked Questions
What is a .dun file?
A .dun file is a Dial-up networking file file. Dial-up networking file
What are the magic bytes for .dun files?
The magic bytes for Dial-up networking file files are 5B 50 68 6F 6E 65 5D at byte offset 0. These bytes uniquely identify the file format regardless of the file extension.
How do I validate a .dun file?
To validate a .dun file, read the first bytes of the file and compare them against the known magic bytes (5B 50 68 6F 6E 65 5D) at offset 0. This is more reliable than checking the file extension alone, as extensions can be renamed.
What is the MIME type for .dun files?
There is no officially registered MIME type for .dun files. Systems typically use application/octet-stream as a generic fallback when handling this format.
Is it safe to open .dun files?
Dial-up networking file (.dun) 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.