Method
- Start from the Overture Maps Foundation places dataset (CDLA-Permissive-2.0), filtered to Turkey: 1,786,700 businesses.
- Take every record that carries a website field: 684,496 businesses.
- Request each address once and record the outcome, whether it was a response, an HTTP status or a network-level failure.
- Assign provinces geographically, by intersecting coordinates with official boundaries, because Overture’s own address region field is null on roughly 92% of Turkish records.
- Group failures into classes and aggregate by province and sector.
Limits
Reachability was measured with a single request per address on 4 September 2026. A site that happened to be down at that moment is counted as unreachable, so the true share of permanently dead addresses is somewhat lower than 39.6%, but not for the DNS class, where a missing record is not a transient condition. HTTP 403 responses are reported separately for the same reason. Nothing is inferred about the content of a site that did answer: a parked page with an advertisement counts as reachable.