noun
within range; within the limits
Typically used in the pattern ～の範囲内 to indicate something is inside a specified scope, limit, or range.
この価格は予算の範囲内です。
This price is within the budget.
調査は法律の範囲内で行われた。
The investigation was conducted within the limits of the law.
以内 is a suffix meaning 'within' (time, distance, amount). 範囲内 is more about conceptual limits or scope.
Compound of 範囲 (range, scope) + 内 (inside, within).