Route 53 is owned and operated by Amazon, yes. (To clarify, though: none of this involves user data in any way. DNS is the internet's phone book, essentially, keeping track of where you should go when you type a domain name into your browser's address bar -- when you type in, say, dw-maintenance.dreamwidth.org, your ISP looks at its own table and sees if it knows where that is, and if it doesn't, it calls up your DNS provider and says "yo, where do I find this address". We're switching the place that your ISP calls to find out where it finds that address.)
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Route 53 is owned and operated by Amazon, yes. (To clarify, though: none of this involves user data in any way. DNS is the internet's phone book, essentially, keeping track of where you should go when you type a domain name into your browser's address bar -- when you type in, say, dw-maintenance.dreamwidth.org, your ISP looks at its own table and sees if it knows where that is, and if it doesn't, it calls up your DNS provider and says "yo, where do I find this address". We're switching the place that your ISP calls to find out where it finds that address.)