The symbols 1, 2, 3, 4, 5, 6, 7, 8, 9, 0, and the hyphen are the only truly international language.
They have the same meaning in every locale. The alphabets of China, India, the Arab world,Japan, Korea, Thailand, to name just a few, are all different. But ‘eleven’ is written 11 wherever you go.
Of course, the international phone system is numbers-based, and so are bank accounts. It’s a blessing.
So, why the heck, is the Internet not. Of course, it is: IP addresses are 4 blocks of 4 numbers. Not necessarily beautiful sequences, though.
Beautiful sequences, though, are a highly priced merchandise. As car plate numbers, for example (somebody paid a million US dollars for number 1 in an emirate). Or as phone numbers.
As a website, 11.com has a price tag not below a million. Even 114.com was bought for more than 2.
Don’t waste your time checking what number from 000 to 999 is still available. They have all been bought decades ago. And nothing free in the 0000 to 9999 range either.