Retrieve all IPs currently in warmup

{
  "type": "array",
  "items": {
    "type": "object",
    "required": [
      "ip",
      "start_date"
    ],
    "properties": {
      "ip": {
        "type": "string",
        "description": "The IP address."
      },
      "start_date": {
        "type": "integer",
        "description": "A Unix timestamp indicating when the IP address entered warmup mode."
      }
    }
  }
}