Tips: curl https://ipinfo.nz → IP only. curl "https://ipinfo.nz?action=ip&full=1" → IP + ASN/ISP lines (+ PTR).
JSON: ?action=json • Plain text: ?action=txt. ICMP may be blocked.
Reachability uses v4. / v6. subdomains; point them to A / AAAA for this host.
?action=json or curl "https://ipinfo.nz?action=json".?action=txt for a snapshot or ?action=ip for IP only.v4. and v6. subdomains; point them to A/AAAA records.