In the United States, the vast majority of sugar glider lineages are stored and shared on The Pet Glider Pedigree Program.
Lineaged breeding is the definitive mark of a glider community breeder. This is a much better criteria to judge a breeder by than whether or not they are USDA licensed. Sugar glider community groups do not allow the advertisement of unlineaged joeys from breeders who choose not to adhere to this community standard.
If you were not given lineage with the glider that you purchased, then you won’t be able to just look them up in the database. Lineage is tracked information, and must be diligently recorded by the chain of breeders down the lines. If your joey’s breeder did not pass on their lineage to you, then either it is lost or never existed. If joeys are sold to pet-only homes, they are often not entered into the database at all to avoid over-cluttering with genetic dead ends. And no, there is not DNA testing for gliders to recover their lost lineages.
The glider community is grateful to The Pet Glider for providing this invaluable service to us all free of charge.