The very first domain name ever registered on the internet was symbolics.com, created in March 1985.
Why it is true
This historic milestone on the World Wide Web was registered by Symbolics Computer Corporation, marking the beginning of the era of commercial internet domains.
Source: ICANN
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This is the reading side of the site, so the answer is in the sentence above — that is the whole point of it. Test yourself works the other way round: the question comes on its own, and the fact and the explanation only appear once you have answered.