A rapist who preyed on 14 teenage girls and young women whom he met through Facebook, Tinder and Snapchat has been jailed for a maximum of 40 years in one of the worst cases of serial sexual assault in the history of the NSW Hunter region.

Andrew James Benn, now 29, of North Rothbury, was ordered on Thursday to serve a non-parole period of 30 years in jail for 33 offences, including 21 counts of rape.

Andrew James Benn was jailed for a maximum of 40 years on Thursday. Credit:NSW Police

He will be 57 and will have spent more than half his life behind bars when he first becomes eligible for parole in 2047.

The public gallery in Newcastle District Court was packed with victims and their supporters as Judge Roy Ellis read a lengthy judgment that detailed Benn's depraved acts, which included repeatedly raping women, forcing himself on girls using "extreme violence", sex with girls as young as 15, blackmailing and threatening victims that the "Hells Angels" would "make them disappear" if they went to police and laughing in the face of desperate and crying victims.