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ASDF 1 refers to any release earlier than 1.369 or so (from August 2001 to October 2009), and to any development revision earlier than 2.000 (May 2010). If your copy of ASDF doesn’t even contain version information, it’s an old ASDF 1. Revisions between 1.656 and 1.728 may count as development releases for ASDF 2.
ASDF 2 refers to releases from 2.000 (May 31st 2010) to 2.26 (Oct 30th 2012), and any development revision newer than ASDF 1 and older than 2.27 (Feb 1st 2013).
ASDF 3 refers to releases from 2.27 (Feb 1st 2013) to 2.33 and 3.0.0 onward (May 15th 2013). 2.27 to 2.33 count as pre-releases to ASDF 3.
ASDF 3.1 refers to releases from 3.1.2 (May 6th 2014) onward. These releases are also considered part of ASDF 3.