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The Network Extension framework mentioned in the post is that API. It's been an iOS thing for a while and came to macOS more recently (10.12, I think).

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The docs say 10.11 for most of the APIs. A few are still (and forever?) iOS only.

Yes, I counted counted versions/WWDC videos wrong - the macOS version popped up in 2015 along with the El Capitan/10.11 announcement.

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