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pierifle t1_j7navgf wrote

Reply to comment by 15rthughes in Came across this purely by accident. Interactive Periodic Table by PubChem. The entire site is absolutely beautiful. by tyrophagia

And I thought my high school with 3 subdomains was crazy

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flunky_the_majestic t1_j7o5kke wrote

Schools in the US often use an eTLD, "effective top level domain", which, although they have multiple levels, they are used as though they were a TLD like .com. The eTLD for schools is k12.{state}.us.

So if they use a www subdomain for their website, you can have lots of dots. I like these domains though, because they are generally unspoofable. You know for sure it's a real school domain if you see it.

Mozilla maintains the de facto authoritative list of these domains in a document called the Public Suffix List. That document has a real effect on how the Internet treats those domains.

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