Investigators found more than 20,000 indecent pictures and videos of his assaults on children, which were shared with paedophiles worldwide through a website hidden in the so-called dark web.
He even tried to make a business out of his abuse by crowd-funding the release of the images and was compiling a paedophile's manual at the time of his arrest by the NCA in December 2014.
Australian police, who traced Huckle, also suspected 17 other British men of using the same websites.
Five of those have now been convicted, two have killed themselves, and five have been arrested and are on bail, the NCA said.
One of the men is still being investigated, no further action was taken in one case, and in the final three cases, the NCA said investigators were "unable to resolve IP [internet protocol] data".
Ahead of his sentencing, Huckle claimed to a psychiatrist that he wanted to put his "madness" behind him and settle down with a south Indian woman.
But the court was shown a posting from 2013 in which he outlined his plan to marry one of his victims in order to help him abuse more children.
Judge Rook said: "In my view, you may well harbour feelings of regret but there is no feeling of genuine remorse in this case."
James Traynor from the NCA's child exploitation and online protection command said Huckle had "deliberately travelled to a part of the world where he thought he could abuse vulnerable children without being caught".
"He spent several years integrating himself into the community in which he lived, making himself a trusted figure. But he abused that trust in the worst possible way."
The NCA was able to use legislation that allows UK nationals to be prosecuted in the UK for offences that have been committed overseas.
"The NCA worked to track down Huckle and end his prolific abuse. Borders are no barrier - we are determined that those who go abroad to abuse children will be held to account," he added.
