}
	iterator := ipIterator(a.offsetAddress, a.lastAddress, offset)
	ip, err := a.allocateFromRange(iterator, svc)
	if err == nil {
		return ip, nil
	}
	// check the lower range
	if a.rangeOffset != 0 {
		offset = uint64(a.rand.Intn(a.rangeOffset))
		iterator = ipIterator(a.firstAddress, a.offsetAddress.Prev(), offset)
		ip, err = a.allocateFromRange(iterator, svc)
		if err == nil {
			return ip, nil
		}
	}