I think a global list of sources would be easier to maintain and document.
Excellent point.
Is NTTCOM no longer trusted?
The available sources are here: https://www.radb.net/query/?advanced_query=1
That does include NTTCOM, so we could use it. But if nobody is
speaking up in favor of it, I'm not currently planning on it.
The list I gave was the union of all choices that exist in IXP
Manager by default, minus ARIN-NONAUTH and RIPE-NONAUTH.
-- Richard