Most domain extension lists i've found only list the ccTLD and TLD portion of the extension (e.g. .uk) and don't list the full set of valid extensions for that ccTLD or TLD (e.g. .org.uk, .ac.uk, .co.uk, etc).
Without researching the registrar policies of every single ccTLD in the world, is there a way for me to compile/obtain a complete list of all current valid domain extensions in the world?