int.parse(specificStringsYouWantToParse, radix: sizeOfRadix); // Use this
//Implementation
void main() {
final fullString = fullStringYouWantToParseFrom;
for (int i = 0; i <= fullString.length - 8; i += 8) {
final hex = fullString.substring(i, i + 8);
final number = int.parse(hex, radix: sizeOfRadix);
print(number);
}