Welcome, here.

How to generate thousands of available names with DynaDot?
  1. Go to our name generator. Select split every 100 results (because DynaDot only allows 100 names per submission)
  2. Use bulk checker. I use Dynadot's checker here. Select only 1 desired domain extension.
  3. Copy the result, all the result from the not available one (with "x"), and paste it here.
  4. Now the not available names are removed from list. And congrats, you get the clean list.
Best regards, Kurniawan.