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DNS is basically a huge associative array [which] gets cached at nameservers

Uhoh. This might be a dangerous meme.

My favorite abuse of DNS is Dan Kaminsky using it to stream DNS.

Explain or link, please?

He tunnelled low-bandswith video over DNS, before finding a more serious bug in DNS.

I meant to say "stream video over DNS", as per acg's link below ... it's been a long day