public IEnumerable<AWSPublicIpAddressRange> AddressRangesByRegion(string regionIdentifier)
{
if (!AllAddressRanges.Any())
throw new InvalidOperationException("No address range data has been loaded and parsed.");
return AllAddressRanges.Where(ar => ar.Region.Equals(regionIdentifier, StringComparison.OrdinalIgnoreCase)).ToList();
}