Yes — autodiscover.justice.cz has IPv6.

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

A
IPv6 readiness
Website, mail and DNS all work over IPv6.
Website over IPv6
autodiscover.justice.cz has an AAAA record and answers on it.
✓ 2001:af0:ffee:200::c2d5:29f9 answers · 443
yes
Mail servers (MX) have IPv6
No MX records, so mail goes to the domain's own address (implicit MX). It has an AAAA record.		yes
Nameservers have IPv6
4 of 4 nameservers checked have an AAAA record, so IPv6-only resolvers can look the domain up.
nadns1.justice.cz ✓nadns2.justice.cz ✓nadns3.justice.cz ✓nadns4.justice.cz ✓
yes
HTTPS over IPv6 · not part of the grade yet
The certificate served over IPv6 at 2001:af0:ffee:200::c2d5:29f9 isn't valid for autodiscover.justice.cz: SELF_SIGNED_CERT_IN_CHAIN.
https://autodiscover.justice.cz/ via 2001:af0:ffee:200::c2d5:29f9 · SELF_SIGNED_CERT_IN_CHAIN
problem
 Load autodiscover.justice.cz over IPv6 from up to six other places — a second opinion.

Nothing keeping you from an A

  1. The certificate served over IPv6 is wrong
    The certificate served over IPv6 at 2001:af0:ffee:200::c2d5:29f9 isn't valid for autodiscover.justice.cz: SELF_SIGNED_CERT_IN_CHAIN. Often the IPv6 address points at a different server (or an old one) than IPv4 does. Make sure 2001:af0:ffee:200::c2d5:29f9 serves the same certificate as your IPv4 address.

Check again

autodiscover.justice.cz  Has IPv6

A (IPv4)194.213.41.249
AAAA (IPv6)2001:af0:ffee:200::c2d5:29f9

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/cvZYZdMd2V · How we measure

Checked 2026-11-05 19:52:05 UTC. Full DNS report: dns.pizza/domain/autodiscover.justice.cz · Age, certificate and blocklists: how.is/autodiscover.justice.cz · JSON: /api/v1/autodiscover.justice.cz