private async Task <bool> AttemptRawBulkCrawl(IPAddressRange parentRange)
        {
            if (parentRange == null)
            {
                throw new ArgumentNullException("parentRange");
            }

            var maxIP = await this.AttemptRawBulkCrawl(parentRange.ToCidrString());

            return(maxIP != null);
        }
 private string GetTestFile()
 {
     return($"# Comment\n{range1.ToCidrString()}\n\n{range2.ToCidrString()}\n{range3.ToCidrString()}\n");
 }