CDC NIOSH N95 List of Manufacturers with Model number and approval number
List of Chinese made KN95s authorized for emergency use by the FDA
Models that were removed from FDA emergency use list
The CDC will test your KN95 here, but only if it is listed on the authorized list linked above
Respirators that are non-NIOSH that the CDC tested
3M Resources for COVID19 healthcare workers – everything on one page. Great resource!