Niels, you are correct about my initial tweet, which I updated in later tweets to clarify with a hat tip to Will Hargrave as thanks for seeking more detail.
Cheers, Ryan On Tue, Oct 5, 2021 at 08:24 Niels Bakker <[email protected]> wrote: > * [email protected] (Lou D) [Tue 05 Oct 2021, 15:12 CEST]: > >Facebook stopped announcing the vast majority of their IP space to > >the DFZ during this. > > People keep repeating this but I don't think it's true. > > It's probably based on this tweet: > https://twitter.com/ryan505/status/1445118376339140618 > > but that's an aggregate adding up prefix counts from many sessions. > The total number of hosts covered by those announcements didn't vary > by nearly as much, since to a significant extent it were more specifics > (/24) of larger prefixes (e.g. /17) that disappeared, while those /17s > stayed. > > (There were no covering prefixes for WhatsApp's NS addresses so those > were completely unreachable from the DFZ.) > > > -- Niels. >
