Thank you for that. It has had several different homes over the last few versions of macOS and I struggled to find it this time.

Hi Quinn - thanks for the confirmation.

Thanks for looking Quinn. I understand the benefits of using the system resolver and in general I do. However there are times when it's handy to check alternate name servers to see if records have propogated, compare response times between servers and stuff like that. I guess this can all be done from calling out to host or dig, but the <dns.h> api was there so I used it.