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Re:Ask HN: HN data access by Mz on Wednesday March 13, 2013 @12:42AM (#5366854)
I am not sure, but I think the IDs count posts and comments. So I think that means about 4 million submissions and over a million comments. Not all submissions draw comments.

Can anyone verify this?

Re:Ask HN: HN data access by pasbesoin on Wednesday March 13, 2013 @09:12PM (#5372447)
Look at the URLs for a submission (found via its "discuss" link on the post listing page) and for a non-post comment. They are identical in format; only the ID value varies.

For this to work, they must share the same set of ID values.