2026-qurbat-list-domains-blocked
findings extracted from this paper
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A compiled blocklist dataset documents 43,083 apex domains blocked via DNS filtering across 6 Indian ISPs, representing one of the largest systematic inventories of Indian DNS censorship scope published to date.
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The dataset incorporates Tranco popularity rankings for blocked domains (derived from the 'Poisoned Wells' research), enabling measurement of how DNS blocking in India intersects with high-traffic websites rather than being confined to obscure domains.
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The blocklist spans 6 distinct Indian ISPs, enabling cross-ISP consistency analysis; the multi-ISP scope reflects that DNS-based blocking in India is implemented heterogeneously at the ISP level rather than via a single national chokepoint.
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DNS filtering is the documented primary blocking mechanism across the 6 surveyed Indian ISPs, with no evidence in this dataset of complementary IP-blocking or SNI-based blocking layers, suggesting the censor relies on DNS as a sufficient single-layer enforcement point.