418
HTTP 418 I'm a teapot
HTTP status code from RFC 2324 (Hyper Text Coffee Pot Control Protocol, an April Fools' RFC): the server refuses to brew coffee because it is, permanently, a teapot.
Similar magic numbers
| value | name | category |
|---|---|---|
| 41 4F 4C | AOL config files | file-signature |
| 41 43 76 | Steganos virtual secure drive | file-signature |
| 41 43 31 30 | Generic AutoCAD drawing | file-signature |
| 41 42 6F 78 | Analog Box (ABox) circuit files | file-signature |
| 41 43 53 44 | AOL parameter-info files | file-signature |