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Trace route can help with that somewhat, I've noticed that a few times with redundant connections

The problem with traceroute is that it won’t show that two different ISPs are leasing strands out of the same bundle.

All of the unexpected shared infra issues I’ve observed have been down at this lower level that never shows up at the IP layer.

Is there a directory or service one can use to get that information?

In my experience this exists for ISPs, but it's not easily available. I've used ISP brokers in the past and they've had this information in some proprietary systems when I've asked for quotes and proposals.

My experience corroborates this.

I worked at two small ISPs, each with a fiber network spanning a few US states. They had their own databases to track this information, but as far as I know there was no central database. One of them used OSPInsight backed by a self-hosted SQL Server database. I don't know what the other place used.

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