I'm trying to find an official list of tier 1 ISPs. I found a list on Wikipedia but can't quite understand how it was compiled, it just lists AS rank as a source. I also found some other websites that provide a list but don't cite a source.

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1 Answer 1


There is no standard defining 'tier 1'. So no, there's no formal list. There are many slightly different interpretations on what a tier 1 is.

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