Вадим

netstat -ntu | awk '{print $5}' | grep -vE "(Address|servers|77.37.156.60|79.137.175.245|192.168.5.201|95.163.251.234|127.0.0.1|8.8.8.8|8.8.4.4)" | cut -d: -f1 | sort | uniq -c | sort -n| sed 's/^[ \t]*//'

/*
 *  ...to startup
 *    app.UseMiddleware<AnsHttpExceptionHandler>();
 */
public class MyHttpException(HttpStatusCode statusCode) : Exception
{
  public HttpStatusCode StatusCode { get; set; } = statusCode;
}

public class MyHttpExceptionHandler(RequestDelegate pipeline)
{
  private readonly RequestDelegate request = pipeline;
  public Task Invoke(HttpContext context) => return InvokeAsync(context);
  async Task InvokeAsync(HttpContext context)
  {
    try { await request(context); }
    catch (AnsHttpException exception)
    {
      context.Response.StatusCode = (int)exception.StatusCode;
      context.Response.Headers.Clear();
    }
  }
}

@{
  throw new MyHttpException(HttpStatusCode.NotFound);
}