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Indeed I noticed the same issue for my customers using .io domains (and me unfortunately): https://twitter.com/updownio/status/910508435720065024

Seems to be getting better now. High TTL helps but mostly if it was there before so do it now for the next downtime (it's frequent with .io)

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The problem is not actually downtime, because DNS handles that automatically if at least one nameserver is up. The problem is nameservers returning incorrect results. But yeah, .io has quite frequent problems.

Yeah for a DNS server returning wrong results is basically a downtime to me

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