> five networks: Meta, Akamai, Google, Netflix, Amazon (I don’t know there is a decent name for these but i’ve been calling them the The “Magna” networks)

At a time when Meta was Facebook, there were FANG (Facebook, Amazon, Netflix, Google) and FAANG (with Apple), but it seems to be more used in a finance context.

great post! key points for me:

1. 100 IXes alone would get 56% IPv4 and 61% IPv6 prefixes, but ~14% reachability

2. little uniqueness between exchanges: not many new prefixes after the top 5

3. for outbound-heavy networks IXes are great, but to attract traffic they are not