How to translate the term sub-range correctly?

Question

Machine translation from one language to another

Here is an example in the original document. I understand everything down to the line. But I can not understand what term to apply to Sub-ranges. I thought = derivatives but somehow I'm not sure.
Sub-ranges data types
A sub-ranges data type is constructed by limiting the range of another data type, usually integers. Limited versions of a data type consist of the name of the data type to be restricted, followed by a lower and an upper bound separated by two dots and enclosed in parentheses. For example:

TYPE Angle :
 INT(-180..+180);
END_TYPE

Answer 1

Ranges -
ranges Sub-ranges - sub-ranges
In terms of spelling - not for me

Answer 2

Subset.