George Duke-Cohan, 19, sparked nationwide panic and a transatlantic investigation from the bedroom of his home in Watford, Hertfordshire, the BBC reported.
Duke-Cohan caused widespread panic in March when he emailed more than 1,700 schools, colleges and nurseries across the UK to warn about an explosive. Hundreds of the schools were evacuated.
He was arrested days later but in April, he sent another batch of emails to schools in the US and UK while under investigation.
The teenager claimed a pipe bomb had been planted on the premises.
NCA investigators, working with the FBI, also found that while on bail for the bomb hoaxes, Duke-Cohan had made a fake report of a hijacked US-bound plane via phone calls to San Francisco Airport and police.
"You were playing a cat-and-mouse game with the authorities. You were playing a game for your own perverted sense of fun in full knowledge of the consequences.
"The scale of what you did was enormous," the judge was quoted as saying by the report.
Marc Horsfall, senior investigating officer with the NCA, said Duke-Cohan had few real friends and spent "a great deal of his time online".
He had no previous convictions and lived with his mother and sister.
His first bomb hoax email was prompted by a disagreement with the owners of VeltPvP, a US-based server that allows users play the game Minecraft.
Duke-Cohan was annoyed at not being given access to higher levels within the game, the NCA said.
The email warned a student had entered schools with a bomb - and demanded USD 5,000 to be deposited in VeltPvP's account.
More than 400 schools across the UK were evacuated before the email was dismissed as a hoax.
Duke-Cohan was arrested at home within two days, and his laptops, USB sticks and mobile phones were seized, the report said.
(This story has not been edited by Business Standard staff and is auto-generated from a syndicated feed.)