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Here are two examples of Facebook photo URLs:



These photos are in the same album, uploaded around the same time, but are stored/served from two different CDNs. The structure of the filename, however, remains the same.

So far, I've figured out that the second segment (10150475426535531 and 10150446026655531, respectively) is the unique photo ID, and the last segment (n in both these examples) is the size of the photo.

I'm wondering if there's any significance to the first and third segments of the filename. It is not album ID nor do I think they are timestamps. Are they just random, or do they mean anything?

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