I was surprised to discover that 2.us.pool.ntp.org returned 2001:4860:4806:4::, which is apparently in the pool:
https://www.ntppool.org/scores/2001:4860:4806:4::
Since it implements leap second smearing, it seems like this wouldn’t be consistent with other ntp pool servers… Is this the result of someone accidentally adding time.google.com to the pool?
Thank you; yes – that shouldn’t be there (because Google didn’t add it and yes, because it’s leap smearing). I’ve marked it to not be included in the pool.