[outages] ntp.org DNS lookups failing

[Stephane Bortzmeyer]

On Wed, Jan 18, 2017 at 09:25:23PM +0100,
 Gert Doering via Outages <outages at outages.org> wrote 
 a message of 52 lines which said:

> This looks like a name server set change, and the old servers failed /
> stopped to answer.  

Right, and DNSDB supports this explanation:

https://gist.github.com/bortzmeyer/8643239b33556257750a10a2cfd46600#gistcomment-1974838