Yes — autodiscover.cdu.de has IPv6.

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

This is a saved measurement from 2026-11-15 17:39 UTC. Check autodiscover.cdu.de live now

IPv6 readiness

Website, mail and DNS all work over IPv6.

Website over IPv6 autodiscover.cdu.de has 4 IPv6 addresses and answers on every one we tested (4 more not tested). ✓ 2603:1036:207:458::8 answers · 80✓ 2603:1036:302:880::8 answers · 80✓ 2603:1036:302:4155::8 answers · 80✓ 2603:1036:302:415a::8 answers · 80– 2603:1036:302:415c::8 not tested– 2603:1036:302:415e::8 not tested– 2603:1036:302:505a::8 not tested– 2603:1036:302:505e::8 not tested	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 4 nameservers checked have an AAAA record, so IPv6-only resolvers can look the domain up. ns1.cdu.de ✗ns1.arcor-ip.de ✓ns2.arcor-ip.de ✓ns3.arcor-ip.de ✓	yes

HTTPS over IPv6 · not part of the grade yet
autodiscover.cdu.de didn't complete an HTTPS request over IPv6 (ECONNREFUSED).

https://autodiscover.cdu.de/ via 2603:1036:207:458::8 · ECONNREFUSED

Nothing keeping you from an A

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

Check again

autodiscover.cdu.de Has IPv6

Alias of	autodiscover.outlook.com → autodiscover.outlook.cloud.microsoft → atm.autodiscover.mira.tm.svc.cloud.microsoft
A (IPv4)	40.104.16.232 40.104.46.24 40.104.47.104 52.96.19.88 52.96.87.232 52.96.109.248 52.96.182.120 52.96.242.24
AAAA (IPv6)	2603:1036:207:458::8 2603:1036:302:880::8 2603:1036:302:4155::8 2603:1036:302:415a::8 2603:1036:302:415c::8 2603:1036:302:415e::8 2603:1036:302:505a::8 2603:1036:302:505e::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

IPv6 measurement: autodiscover.cdu.de
Measured 2026-11-15 17:39:45 UTC by aaaa.bot (one server on Fly.io, region iad)

A (IPv4):    40.104.16.232, 40.104.46.24, 40.104.47.104, 52.96.19.88, 52.96.87.232, 52.96.109.248, 52.96.182.120, 52.96.242.24
AAAA (IPv6): 2603:1036:207:458::8, 2603:1036:302:880::8, 2603:1036:302:4155::8, 2603:1036:302:415a::8, 2603:1036:302:415c::8, 2603:1036:302:415e::8, 2603:1036:302:505a::8, 2603:1036:302:505e::8

Readiness grade A: Website, mail and DNS all work over IPv6.
- Website over IPv6: autodiscover.cdu.de has 4 IPv6 addresses and answers on every one we tested (4 more not tested).
    2603:1036:207:458::8: answers (TCP 80)
    2603:1036:302:880::8: answers (TCP 80)
    2603:1036:302:4155::8: answers (TCP 80)
    2603:1036:302:415a::8: answers (TCP 80)
    2603:1036:302:415c::8: not tested
    2603:1036:302:415e::8: not tested
    2603:1036:302:505a::8: not tested
    2603:1036:302:505e::8: not tested
- Mail servers (MX) have IPv6: No MX records, so mail goes to the domain's own address (implicit MX). It has an AAAA record.
- Nameservers have IPv6: 3 of 4 nameservers checked have an AAAA record, so IPv6-only resolvers can look the domain up.

Reachability = a TCP connection opened on port 443 (or 80).

HTTPS over IPv6 (not graded): autodiscover.cdu.de didn't complete an HTTPS request over IPv6 (ECONNREFUSED).
    https://autodiscover.cdu.de/ via 2603:1036:207:458::8 (ECONNREFUSED)
DNS answers via DNS-over-HTTPS (Cloudflare). Method: https://aaaa.bot/method
Permanent link: https://aaaa.bot/r/aLqj4eWEBJ

Permanent link: aaaa.bot/r/aLqj4eWEBJ · How we measure

Checked 2026-11-15 17:39:45 UTC. Full DNS report: dns.pizza/domain/autodiscover.cdu.de · Age, certificate and blocklists: how.is/autodiscover.cdu.de · JSON: /api/v1/autodiscover.cdu.de