Ancestral File Number
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An Ancestral File Number is a unique identifier for everyone who has a record in the Ancestral File format. AFNs are used as a genealogical indexing tool by The Church of Jesus Christ of Latter-day Saints (LDS). AFN's consist of 4 capital letters or numbers, a dash, and then 2 or 3 more capital letters or numbers. An AFN does not contain any vowels (A, E, I, O, U, or Y). An example is 1BS3-9X1. AFNs can be searched online at the LDS's website, FamilySearch.