Write-ups of work actually done on this API — including the bugs we shipped, with the numbers. There is no tips-and-tricks content here; it is cheap to produce, which is why it convinces nobody.
An audit of our ASN list against the regional registry found an entry labelled 'WindScribe' that was actually Wake Forest University. Here is how a comment became a false positive against real students.
ReadOur API told customers that every .de, .ru and .ac.uk domain was 'not newly registered'. We had never checked. Here is the one-line bug and why nulls belong in an API response.
ReadMost accuracy claims in this category are unfalsifiable. Two different standards — ground truth where it exists, reference consensus where it does not — and why false positives deserve their own column.
ReadASN lists and per-IP feeds both infer. NordVPN, Mullvad and Surfshark publish their exit nodes at public endpoints their own apps call — which is more authoritative than any heuristic can be.
ReadA German number written 01512 3456789 nationally is +49 1512 3456789 internationally. Naive validation drops the wrong digits and rejects a genuine customer.
Read