Denon Remote App for iPhone:
2012 Models:
Network AV Receiver : AVR-1613, AVR-1713, AVR-1913, AVR-2113CI, AVR-2313CI, AVR-3313CI, AVR-4520CI
Pre-2012 Models:
Network AV Receiver : AVR-A100, AVR-4311CI, AVR-3312CI/3311CI, AVR-2312CI, AVR-2112CI, AVR-1912, AVR-991