An NTP server that responds to NTP time queries. Supports NTPv3 and NTPv4.

Features

• NTPv3 and NTPv4: Mirrors the version sent by the client
• Configurable time source: Use TimeProvider for testability
• Auto-assigned port: Use port 0 for testing to get an auto-assigned port
• OpenTelemetry: Built-in ActivitySource tracing for NTP requests

Methods

Name
StartAsync
Dispose

// Start an NTP server on a random port
using var server = new NtpServer(new NtpServerOptions { Port = 0 });
await server.StartAsync();

Console.WriteLine($"NTP server listening on port {server.Port}");

Custom time source

using var server = new NtpServer(new NtpServerOptions
{
    Port = 0,
    TimeProvider = myCustomTimeProvider,
    Stratum = 2,
});
await server.StartAsync();

Demo

you can run demo and see this feature.