Yes — captainspins.org has IPv6.

Has both IPv4 (A) and IPv6 (AAAA) addresses.

B
IPv6 readiness
Works over IPv6, with one gap: its mail servers lack IPv6.
Website over IPv6
captainspins.org has 2 IPv6 addresses and answers on every one we tested.
✓ 2606:4700:3035::6815:17a2 answers · 443✓ 2606:4700:3033::ac43:d452 answers · 443
yes
www over IPv6
www.captainspins.org has 2 IPv6 addresses and answers on every one we tested.
✓ 2606:4700:3035::6815:17a2 answers · 443✓ 2606:4700:3033::ac43:d452 answers · 443
yes
Mail servers (MX) have IPv6
None of the mail servers has an AAAA record.
_dc-mx.89a2e8066876.captainspins.org ✗
no
Nameservers have IPv6
2 of 2 nameservers checked have an AAAA record, so IPv6-only resolvers can look the domain up.
etta.ns.cloudflare.com ✓miles.ns.cloudflare.com ✓
yes
HTTPS over IPv6 · not part of the grade yet
Loads over IPv6 with a valid certificate: HTTP 200.
https://captainspins.org/ via 2606:4700:3035::6815:17a2 → 200
works
 Load captainspins.org over IPv6 from up to six other places — a second opinion.

What's keeping captainspins.org from an A

  1. Mail servers without IPv6
    _dc-mx.89a2e8066876.captainspins.org has no AAAA record, so mail from IPv6-only servers can't reach it directly. If a provider runs your mail, that's their setting; if you run it, add AAAA records for these hosts.

Check again

captainspins.org  Has IPv6

A (IPv4)104.21.23.162
172.67.212.82
AAAA (IPv6)2606:4700:3035::6815:17a2
2606:4700:3033::ac43:d452

www.captainspins.org  Has IPv6

A (IPv4)172.67.212.82
104.21.23.162
AAAA (IPv6)2606:4700:3035::6815:17a2
2606:4700:3033::ac43:d452

Browsers on dual-stack networks will usually pick IPv6 here (the "Happy Eyeballs" algorithm races both and prefers v6).

Copy the evidence — a citation-ready record of this measurement

 Permanent link: aaaa.bot/r/L2Ln5TYRw6 · How we measure

Checked 2026-11-04 15:05:14 UTC. Full DNS report: dns.pizza/domain/captainspins.org · Age, certificate and blocklists: how.is/captainspins.org · JSON: /api/v1/captainspins.org