code: @Override
  	public IPv4Address[] spanWithPrefixBlocks() {
  		if(isSequential()) {
  			return spanWithPrefixBlocks(this);
  		}
  		@SuppressWarnings("unchecked")
  		ArrayList<IPv4Address> list = (ArrayList<IPv4Address>) spanWithBlocks(true);
  		return list.toArray(new IPv4Address[list.size()]);
  	}
docs: Produces an array of prefix blocks that cover the same set of addresses as this.
  <p>
  Unlike {@link #spanWithPrefixBlocks(IPAddress)} this method only includes addresses that are a part of this subnet.