# NTPNTPHeader


## Fields

| Field                                                                                                                                                                                                                                                            | Type                                                                                                                                                                                                                                                             | Required                                                                                                                                                                                                                                                         | Description                                                                                                                                                                                                                                                      |
| ---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- | ---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- | ---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- | ---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- |
| `LeapIndicator`                                                                                                                                                                                                                                                  | **int*                                                                                                                                                                                                                                                           | :heavy_minus_sign:                                                                                                                                                                                                                                               | 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.       |
| `Mode`                                                                                                                                                                                                                                                           | **int*                                                                                                                                                                                                                                                           | :heavy_minus_sign:                                                                                                                                                                                                                                               | An enumerated value from 0 to 7 signifying the operational mode of the server.                                                                                                                                                                                   |
| `Poll`                                                                                                                                                                                                                                                           | **int*                                                                                                                                                                                                                                                           | :heavy_minus_sign:                                                                                                                                                                                                                                               | The interval within which the server will expect a subsequent synchronization message, in log2 seconds.                                                                                                                                                          |
| `Precision`                                                                                                                                                                                                                                                      | **int*                                                                                                                                                                                                                                                           | :heavy_minus_sign:                                                                                                                                                                                                                                               | The precision of the system's clock, in log2 seconds.                                                                                                                                                                                                            |
| `ReferenceID`                                                                                                                                                                                                                                                    | **string*                                                                                                                                                                                                                                                        | :heavy_minus_sign:                                                                                                                                                                                                                                               | 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`                                                                                                                                                                                                                                                        | **int*                                                                                                                                                                                                                                                           | :heavy_minus_sign:                                                                                                                                                                                                                                               | 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. |
| `Version`                                                                                                                                                                                                                                                        | **int*                                                                                                                                                                                                                                                           | :heavy_minus_sign:                                                                                                                                                                                                                                               | The NTP version indicated in the server's response.                                                                                                                                                                                                              |