NCMEC is the U.S. hotline. IWF is the British hotline. They exchange information with each other and pass information through to law enforcement after reviewi

NCMEC is the U.S. hotline. IWF is the British hotline. They exchange information with each other and pass information through to law enforcement after reviewing it. Different hotlines may differ in what reports they're willing to take depending on what's banned locally. IWF is legally mandated to take reports on cartoons. NCMEC isn't in theory but they might take it and pass it onto the user's country due to lack of manpower.