[wmf]

I think this is the answer: https://aws.amazon.com/ivs/ It's branded as an AWS service but it's delivered over the Twitch CDN.

[Blahah]

Other way around. It's branded as twitch, but delivered over aws. Twitch doesn't own any infrastructure.

[wmf]

So what's the difference between AS46489 and AS16509?

[reincoder]

99.181.66.216 belongs to AS46489 [0], mainly used to serve Twitch. AS16509 is your standard AWS cloud AS hosting data center IPs.

[0] https://ipinfo.io/AS46489

[1] https://ipinfo.io/AS16509

[Blahah]

One is amazon for unspecified purposes and the other is amazon providing service long term to twitch.