Magic Numbers
Magic numbers might help identify file types
File type |
Hex signature in start of file |
MIME type |
jpeg |
ff d8 ff |
image/jpeg |
png |
89 50 4e 47 |
image/png |
bz2 |
42 5A 68 |
application/octet-stream |
gif |
47 49 46 38 37 61 |
image/gif |
gif |
47 49 46 38 39 61 |
image/gif |
zip jar apk docx ipa pptx xlsx |
50 4B 03 04 |
application/octet-stream |
Java class |
CA FE BA BE |
application/octet-stream |
tar |
75 73 74 61 72 |
application/octet-stream |
gzip |
1F 8B |
application/octet-stream |