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A comment on Tell HN: Amazon now owns 3.0.0.0/8. Parent comment

Re:Tell HN: Amazon now owns 3.0.0.0/8 by merb on Thursday November 08, 2018 @01:42PM (#18408703)
multicast is like a broadcast except that it is authenticated, i.e each device that is authenticated against a certain multicast will get the content.

it's mostly used for internet television or other multimedia stuff.

(some stuff is/was unallocated, since some early users tought it's a good idea to actually use some unallocated stuff to do bgp..., testing or routing per se (especially cisco routers) or even login pages, exist nodes, i.e. 1.0.0.0 was a problematic ip, but since cloudflare grabbed the 1.1.1.1 I think people will stop doing stupid things)

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Re:Tell HN: Amazon now owns 3.0.0.0/8 by sofaofthedamned on Thursday November 08, 2018 @03:58PM (#18409965)
It's nothing to do with authentication, it's simply indicating you want the data. If authentication or encryption is used it's nothing to do with multicast.
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