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Hmm every .io domain on this page has worked for me even if I've never visited them before. Maybe my ISP (VirginMedia) has cached the records.

It's somewhat random, so it seems you had good luck today.

From what I read in this thread, the odds of it working is 2 in 7, so it's pretty likely a good portion of the commenters will say it works for them.

All working for me too, same ISP.