I've recently been looking for the IP prefixes originating from a specific AS. And there are a few questions I'd like to get confirmed.
We can register IP addresses and ASN from RIR. But where can we get the accurate mapping between ASN and the IP prefix? Is there an official information distribution agency?
As far as I know, one IP address is owned by one AS. However, I find 8.8.8 belongs to different ASes from bgp.he.net. I also don't know why different ASes have overlapping prefixes. (18.104.22.168/12 - 22.214.171.124/24) Is this a data platform problem or the result of route aggregation?