HP Q6511A Compatible toner fits the following Models:
HP LaserJet 2400 Series
HP LaserJet 2410 25PPM
HP LaserJet 2420 30PPM
HP LaserJet 2420d 30PPM
HP LaserJet 2420dn 30PPM
HP LaserJet 2420n 30PPM
HP LaserJet 2430dtn 35PPM
HP LaserJet 2430n 35PPM
HP LaserJet 2430tn 35PPM