MongoDB's ObjectID is a 12-byte identifier broken down into the following components:
| Component | Size (bytes) | Bitwise Breakdown | Description |
|---|---|---|---|
| Timestamp | 4 bytes | 0 - 31 (0x00000000 - 0xFFFFFFFF) | 32-bit Unix timestamp (seconds since epoch) |
| Machine ID | 3 bytes | 32 - 55 (0x000000 - 0xFFFFFF) | Identifier for the machine generating the ObjectID |
| Process ID | 2 bytes | 56 - 71 (0x0000 - 0xFFFF) | Process ID across multiple processes |
| Counter | 3 bytes | 72 - 95 (0x000000 - 0xFFFFFF) | Counter for IDs created at the same timestamp |
- Timestamp (4 bytes): 6758617b
- Machine ID (3 bytes): 454a2a
- Process ID (2 bytes): 80b8
- Counter (3 bytes): 5fedd1
Output
Machine ID: EJ*
6758617b454a2a80b85fedc3
6758617b454a2a80b85fedc4
6758617b454a2a80b85fedc5
6758617b454a2a80b85fedc6
6758617b454a2a80b85fedc7
6758617b454a2a80b85fedc8
6758617b454a2a80b85fedc9
6758617b454a2a80b85fedca
6758617b454a2a80b85fedcb
6758617b454a2a80b85fedcc
6758617b454a2a80b85fedcd
6758617b454a2a80b85fedce
6758617b454a2a80b85fedcf
6758617b454a2a80b85fedd0
6758617b454a2a80b85fedd1