{
  "$schema": "https://json-structure.org/meta/core/v0/#",
  "$id": "https://raw.githubusercontent.com/api-evangelist/censys/refs/heads/main/json-structure/platform-ntp-ntpheader-structure.json",
  "name": "Ntp_NTPHeader",
  "description": "Ntp_NTPHeader schema from Censys Platform API",
  "type": "object",
  "additionalProperties": false,
  "properties": {
    "leap_indicator": {
      "type": "int32",
      "description": "An enumerated value from 0 to 3 signifying whether a leap second will occur at the end of the current month. 0 signifies no leap second, 1 signifies an additive leap second, 2 signifies a subtractive leap second, and 3 signifies the state is unknown.",
      "minimum": 0
    },
    "mode": {
      "type": "int32",
      "description": "An enumerated value from 0 to 7 signifying the operational mode of the server.",
      "minimum": 0
    },
    "poll": {
      "type": "int32",
      "description": "The interval within which the server will expect a subsequent synchronization message, in log2 seconds."
    },
    "precision": {
      "type": "int32",
      "description": "The precision of the system's clock, in log2 seconds."
    },
    "reference_id": {
      "type": "string",
      "description": "The identifier of the reference clock. For servers in stratum 1, one of an IANA-maintained list of sources. For servers in stratum 2, the ID of the stratum 1 server from which the time was retrieved (usually, its IP address), etc."
    },
    "stratum": {
      "type": "int32",
      "description": "The number of servers between a client and a non-NTP time source. 1 signifies that the server is authoritative, having direct access to a sensor. 2 signifies that the server got its time from a \"stratum 1\" server, etc. 16 means the clock is unsynchronized.",
      "minimum": 0
    },
    "version": {
      "type": "int32",
      "description": "The NTP version indicated in the server's response.",
      "minimum": 0
    }
  }
}