An NTP client library for querying NTP servers to retrieve accurate network time. Supports NTPv3 and NTPv4.

Features

• NTPv3 and NTPv4: Configurable protocol version
• Clock offset calculation: Computes the time difference between client and server
• Round-trip delay: Measures network round-trip time
• Async/await: Fully asynchronous API with cancellation support
• OpenTelemetry: Built-in ActivitySource tracing for NTP queries

Methods

Name
QueryAsync
Dispose

// Query an NTP server using NTPv4 (default)
using var client = new NtpClient("pool.ntp.org");
var response = await client.QueryAsync();

Console.WriteLine($"Server time: {response.TransmitTimestamp}");
Console.WriteLine($"Clock offset: {response.ClockOffset}");
Console.WriteLine($"Round-trip delay: {response.RoundTripDelay}");
Console.WriteLine($"Stratum: {response.Stratum}");

Using NTPv3

using var client = new NtpClient("pool.ntp.org", new NtpClientOptions
{
    Version = NtpVersion.V3,
});
var response = await client.QueryAsync();

Cancellation and timeout

using var cts = new CancellationTokenSource(TimeSpan.FromSeconds(10));
using var client = new NtpClient("time.google.com");
var response = await client.QueryAsync(cts.Token);

Custom port

using var client = new NtpClient("localhost", new NtpClientOptions
{
    Port = 12345,
});
var response = await client.QueryAsync();

Demo

you can run demo and see this feature.