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This tool looks really good. It seems like soon ASN level bot-curbing will become common.
A while ago there was a large data center outage that effected a lot of popular services and I speculated it might have been BGP, but it wasn't.

During that time I was trying to learn BGP on-the-fly enough to know if this was a thing and I didn't have a lot of luck.

What are some good methods or tools to know if BGP is causing a large scale outage before other experts have reported it?

I find the map the most interesting map: https://map.bgp.tools/

And did not know Mercedes holds such a large block (53.0.0.0/8), and it appears to be mostly dark or unused.

Just a fascinating map. Like looking into Neuromancer’s cyberspace.

Is there a legend of what the different colors mean?

bgp.tools is one of my most used sites - thanks to ben for doing this so great!