<![CDATA[Indonesia’s national internet penetration has continued to increase, reaching 80.66% in 2025, equivalent to 229,428,417 connected people from a total population of 284,438,900. However, this national achievement does not fully represent regional equality in digital infrastructure readiness. This study proposes an Explainable Entropy-TOPSIS framework to develop a Regional Digital Infrastructure Priority Index (RDIPI) across six Indonesian island groups using APJII 2025 indicators. The model transforms internet penetration, regional contribution, and ISP distribution into three priority-oriented criteria: access gap, ISP supply gap, and demand-supply shortage. The entropy weighting results show that demand-supply shortage is the dominant criterion with a weight of 0.8192, followed by ISP supply gap = 0.1292 and access gap = 0.0517. The TOPSIS results indicate that Sumatra has the highest infrastructure priority with an RDIPI score of 0.9840, followed by Maluku-Papua = 0.5226, Sulawesi = 0.3699, Kalimantan = 0.2422, Bali-Nusa Tenggara = 0.2013, and Java = 0.0000. These findings suggest that digital infrastructure priority should not be determined only by low penetration, but also by the imbalance between internet-user contribution and ISP representation. The proposed framework provides an explainable decision-support approach for APJII, ISPs, and policymakers in designing targeted broadband expansion and digital inclusion strategies.]]>
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