How to add AAAA flag (IPv6) to DNS resolver configuration on Sierra?

I have working IPv6 interface with /64 prefix. It means I can connect to direct IPv6 addresses through browser but can't connect to IPv6 hosts like testv6.madore.org. The issue is in DNS configuration where I don't have flag "Request AAAA records": $ scutil --dns resolver #1 search domain : xxxxxxxx nameserver : xxxxxxxx nameserver : xxxxxxxx nameserver : xxxxxxxx if_index : 4 (en0) flags : Scoped, Request A records reach : Reachable Can someone tell me how to manually add/enable that flag too look like: flags : Scoped, Request A records, Request AAAA records