Yes — autodiscover.master.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.master.cz has 4 IPv6 addresses and answers on every one we tested.
✓ 2603:1036:304:807::8 answers · 80✓ 2603:1036:304:2855::8 answers · 80✓ 2603:1036:304:3408::8 answers · 80✓ 2603:1036:304:2853::8 answers · 80
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
3 of 3 nameservers checked have an AAAA record, so IPv6-only resolvers can look the domain up.
ns1.master.cz ✓ns2.master.cz ✓ns3.master.cz ✓
yes
HTTPS over IPv6 · not part of the grade yet
autodiscover.master.cz didn't complete an HTTPS request over IPv6 (ECONNREFUSED).
https://autodiscover.master.cz/ via 2603:1036:304:807::8 · ECONNREFUSED
?
 Load autodiscover.master.cz over IPv6 from up to six other places — a second opinion.

Nothing keeping you from an A

  1. Nothing to fix
    Show it off: add the badge to your README.
    [![IPv6](https://aaaa.bot/badge/autodiscover.master.cz.svg)](https://aaaa.bot/autodiscover.master.cz)

Check again

autodiscover.master.cz  Has IPv6

Alias ofautodiscover.outlook.com → autodiscover.outlook.cloud.microsoft → acdcatm.autodiscover.mira.tm.svc.cloud.microsoft → autod.ms-acdc-autod.office.com
A (IPv4)52.96.79.72
52.96.88.88
52.96.122.40
52.96.183.40
AAAA (IPv6)2603:1036:304:807::8
2603:1036:304:2855::8
2603:1036:304:3408::8
2603:1036:304:2853::8

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/bUgnuKXKkU · How we measure

Checked 2026-11-05 20:40:26 UTC. Full DNS report: dns.pizza/domain/autodiscover.master.cz · Age, certificate and blocklists: how.is/autodiscover.master.cz · JSON: /api/v1/autodiscover.master.cz