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ubnt.com - the performance stats on the internet and I think some of the external app bits
nest.com - I suspect that ability to check in on the Nest bits that I've got round the house (3 thermostats, and 3 smoke alarms)I think that even if they are blocked at nextdns, they still count as a lookup (which is fair enough)
I think that unbt had about 10k lookups (which is slightly nuts, a ping every 30 seconds), and nest about 5K (so one a minute, again a bit nuts TBH).
A PiHole looking to limit queries via aggressive caching and letting nextdns do the heavy lifting might be the answer
What will you lose if you just block these?