Yes — zaku.cat 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
zaku.cat has an AAAA record and answers on it.
✓ 2001:8d8:100f:f000::2bb answers · 443
yes
www over IPv6
www.zaku.cat has an AAAA record and answers on it.
✓ 2001:8d8:100f:f000::2bb answers · 443
yes
Mail servers (MX) have IPv6
None of the mail servers has an AAAA record.
mx01.ionos.es ✗mx00.ionos.es ✗
no
Nameservers have IPv6
4 of 4 nameservers checked have an AAAA record, so IPv6-only resolvers can look the domain up.
ns1106.ui-dns.com ✓ns1024.ui-dns.de ✓ns1061.ui-dns.biz ✓ns1039.ui-dns.org ✓
yes
HTTPS over IPv6 · not part of the grade yet
Loads over IPv6 with a valid certificate: HTTP 200.
https://zaku.cat/ via 2001:8d8:100f:f000::2bb → 200
works
 Load zaku.cat over IPv6 from up to six other places — a second opinion.

What's keeping zaku.cat from an A

  1. Mail servers without IPv6
    mx01.ionos.es, mx00.ionos.es 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

zaku.cat  Has IPv6

A (IPv4)217.160.0.115
AAAA (IPv6)2001:8d8:100f:f000::2bb

www.zaku.cat  Has IPv6

A (IPv4)217.160.0.115
AAAA (IPv6)2001:8d8:100f:f000::2bb

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/z9ShXM2p1W · How we measure

Checked 2026-11-03 16:33:56 UTC. Full DNS report: dns.pizza/domain/zaku.cat · Age, certificate and blocklists: how.is/zaku.cat · JSON: /api/v1/zaku.cat