I use https://dns.he.net/ .

Simple and supports all kinds of records.

Is there a way to run a Mac on ZFS? (With a ZFS boot volume, too.)

Not the entire boot volume, but close. People have put user directories, etc. on ZFS drives. Google "MacZFS" for an older version (ZFS v8) or "Zevo Community Edition" for a more modern version (ZFS v28). There're active discussion boards for both.

Interesting... Thanks!

A startup called Ten's complement has a commercial ZFS implementation for Mac(not boot yet) that's rather stable and full featured as well.

http://tenscomplement.com/

No longer available.

Ah, my mistake. Rather a pity too... they actually had a product that was usable. I suppose the biggest challenge for them was "who will buy this" given that it was targeted for people with large storage arrays attached to Macs. It's a bit of a niche; perhaps people in the media world would bite?

It just moved to http://zevo.getgreenbytes.com/ although I haven't tried downloading it from there.

Does this work on child threads?

Does this apply to iPhones that were bought off contract? (From the Apple Store.)

No. Those are already unlocked and will forever remain unlocked.

Not in the US. iPhones bought for full price from the Apple store in the US were still locked to AT&T.