CI (Ecuador)

The Ecuadorian Cédula de Identidad (CI) is issued by the Dirección General de Registro Civil. It has 10 digits: the first two indicate the province of registration (01–24), the third must be less than 6 for natural persons, and the last is the check digit. The check digit uses a variant of the Luhn algorithm (modulo 10) with alternating coefficients `2,1,2,1,2,1,2,1,2` applied to the first 9 digits. If the resulting sum is a multiple of 10, the check digit is 0; otherwise it's `10 - (sum mod 10)`. The Ecuadorian CI is related to the RUC: when a natural person registers as a taxpayer, their RUC is `{CI}001` — the 10 digits of the cédula plus three sequential digits. That's why many systems validate both identifiers in the same onboarding flow. Normadata validates the CI by checking province, length, charset, and check digit. Verifying the citizen's existence requires a direct query to the Registro Civil.