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Mh.. I think your best bet is still BGP here. You could use the BGP communities and MPLS tags to see what is going on within an AS / Transit provider. Really depends on the ISP and how much information you get there, but no idea how else you could realise that.

Any manually added information is usually outdated really quickly because of how dynamic everything got these days.

Maybe reach out to @benjojo@benjojo.co.uk, with bgp.tools he is monitoring a lot of stuff and tries to process the data so we can get useful information out of them :blobcat: