[mjpa]

Is it really an internet wide outage?

Only 2 of the points in the US are affected on https://www.whatsmydns.net/ for the domains we've got on Dyn - same for Twitter etc

[owenwil]

If it's under a denial-of-service it's possible that it may respond correctly part of the time.

[toast0]

Since many (all?) of Dyn's authoritative server IPs are anycast, attack traffic is probably not well distributed either. If you're routed to a server that's getting a lot of attack traffic, you're likely to have problems, but a server without much attack traffic will work fine.

[geekamongus]

"Widespread" might be a better term.