Domain registr**ies**, not registrars apply to ICANN to own and operate TLDs. [This wiki page](https://en.wikipedia.org/wiki/Top-level_domain) has a little information on the history of it.
>*On 13 June 2012, ICANN announced nearly 2,000 applications for top-level domains, which began installation throughout 2013. The first seven – bike, clothing, guru, holdings, plumbing, singles, and ventures – were released in 2014.*
[This wiki page](https://en.wikipedia.org/wiki/List_of_Internet_top-level_domains) has a full list of TLDs with the registry that operates them.
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