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    My girlfriend later confirmed that there are indeed lots of websites using just numbers as their domains. She told me this is sometimes used as a way to hide websites, mostly gambling and porn, and in some cases even sell access to them by just getting money and giving the secret domain name in exchange.

    I would be slightly disturbed if my girlfriend knew about secret gambling and porn websites.

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      When I hear numerical domains, the first thing that comes to mind is the website of Intel Open Source Technology Center: https://01.org/