IPv6 Tools:
  /ipv6?tool=analyze&q=2001:db8::1   Analyze an IPv6 address
  /ipv6?tool=aaaa&domain=google.com   AAAA record lookup
  /ipv6?tool=ping6&host=google.com    IPv6 ping
  /api/ipv6/analyze?q=...             JSON API
  /api/ipv6/aaaa?domain=...           JSON API
  /api/ipv6/ping6?host=...            JSON API