Looking at my Rev A, I see nothing regarding IPv6. I enabled IPv6 on my router to check. I got IPv6 on my Mac, however there isn't anything on the 933L in regards to IPv6. I always tend to look at main site specs or user manual spec or Mfr data sheets for specs. Etailers may not be most accurate and tend to copy and paste quick information from other sources which may not be accurate. Any spec info would be best gained by phone contacting D-Link directly to confirm.
Official word I got is that IPv6 is not supported on the 933L.