Please follow the instructions located on our website here http://www.getflix.com.au/setup/ps3 to configure our DNS servers on your PS3/PS4.
Netflix on the PS3 and PS4
The Netflix app on the PS3 and PS4 is hard-coded to use public DNS servers. The good news is if you block access to these public DNS servers, it falls back to the DNS servers configured on your device (ours!).
See the instructions here: Block Public DNS Servers