The Training Provider Registry (TPR) is a database maintained by the Federal Motor Carrier Safety Administration (FMCSA). It lists training providers that have registered with FMCSA and self-certified that they meet the applicable federal requirements.
The TPR is the official source for finding training providers listed for the applicable ELDT training type. It also receives electronic training completion records from listed providers.
You can learn more about the TPR here: https://tpr.fmcsa.dot.gov/.