Yes — 41masuno.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
41masuno.org has 2 IPv6 addresses and answers on every one we tested.
✓ 2606:4700:3033::6815:2a90 answers · 443✓ 2606:4700:3031::ac43:a283 answers · 443
yes
Mail servers (MX) have IPv6
None of the mail servers has an AAAA record.
mx01.mail.icloud.com ✗mx02.mail.icloud.com ✗
no
Nameservers have IPv6
2 of 2 nameservers checked have an AAAA record, so IPv6-only resolvers can look the domain up.
ollie.ns.cloudflare.com ✓seth.ns.cloudflare.com ✓
yes
HTTPS over IPv6 · not part of the grade yet
Loads over IPv6 with a valid certificate: HTTP 403.
https://41masuno.org/ via 2606:4700:3033::6815:2a90 → 403
works
 Load 41masuno.org over IPv6 from up to six other places — a second opinion.

What's keeping 41masuno.org from an A

  1. Mail servers without IPv6
    mx01.mail.icloud.com, mx02.mail.icloud.com have no AAAA record, so mail from IPv6-only servers can't reach them directly. If a provider runs your mail, that's their setting; if you run it, add AAAA records for these hosts.

Check again

41masuno.org  Has IPv6

A (IPv4)104.21.42.144
172.67.162.131
AAAA (IPv6)2606:4700:3033::6815:2a90
2606:4700:3031::ac43:a283

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/5kqDqy3ClM · How we measure

Checked 2026-11-03 06:54:43 UTC. Full DNS report: dns.pizza/domain/41masuno.org · Age, certificate and blocklists: how.is/41masuno.org · JSON: /api/v1/41masuno.org