Event ID 16647 — The domain controller is starting a request for a new account-identifier pool.

{
  "system": {
    "provider": "Microsoft-Windows-Directory-Services-SAM",
    "guid": "0D4FDC09-8C27-494A-BDA0-505E4FD8ADAE",
    "event_source_name": "",
    "event_id": 16647,
    "version": 0,
    "level": 4,
    "task": 0,
    "opcode": 0,
    "keywords": 9223372036854775808,
    "time_created": "2022-04-07T08:14:41.496467+00:00",
    "event_record_id": 696,
    "correlation": {},
    "execution": {
      "process_id": 648,
      "thread_id": 856
    },
    "channel": "System",
    "computer": "WIN-FPV0DSIC9O6.lab.local",
    "security": {
      "user_id": "S-1-5-18"
    }
  },
  "event_data": {
    "Name": "SAMMSG_REQUESTING_NEW_RID_POOL"
  },
  "message": ""
}