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by ntrz 1783 days ago
Seems like it tests a limited list[0] of domains associated with the site or service, with the final result based on a check of their DNS records. For Steam, looks like it only checks <store.steampowered.com>, <steamcommunity.com>, and <help.steampowered.com>.

It'd be nice if the site provided an explanation of the process, maybe with some way to expand a particular entry and see which associated domains were tested and which succeeded/failed.

[0] https://github.com/andir/ipv6.watch/blob/master/conf.yaml