The common_flags field on an object is a bit mask; add the following values together to get the final value.
| 1 | Invisible |
| 2 | Immovable |
| 4 | Background |
| 8 | Closed |
| 16 | Locked |
| 32 | Restricted *1 |
| 64 | Inactive |
| 128 | (restricted?) |
| 256 | Temporary Immobile |
| 512 | Glued (Turf) *2 |
| 1024 | Has Properties *3 |
| 2048 | Engravable object *4 |
| 4096 | Paintable object *5 |
| 8192 | |
| 16384 | |
| 32768 | |
| 65536 | Is Spawner |
| 131072 | Is Crafting Table |
| 262144 | Auto On/Off Object *6 |
Notes: