The .at top-level domain has a number of second-level domains. These are:
However, it is also possible to register, unrestrictedly, directly at the second level. Given the number of English words that end with -at, this presents the possibility for many domain hacks. bo.at is an example to put into consideration, despite there are at least three characters for the second level required, e.g. form.at. Domain hacks treating "at" as a word in its own right (such as arrive.at) are also widespread.
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