Yes — microsoft365domain.com has IPv6.

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

IPv6 readiness

Website, mail and DNS all work over IPv6.

Website over IPv6 microsoft365domain.com has 2 IPv6 addresses and answers on every one we tested. ✓ 2606:4700:3033::ac43:ae12 answers · 443✓ 2606:4700:3036::6815:502b answers · 443	yes
www over IPv6 www.microsoft365domain.com has 2 IPv6 addresses and answers on every one we tested. ✓ 2606:4700:3033::ac43:ae12 answers · 443✓ 2606:4700:3036::6815:502b answers · 443	yes
Mail servers (MX) have IPv6 Every mail server has an AAAA record. microsoft365domain-com.mail.protection.outlook.com ✓	yes
Nameservers have IPv6 2 of 2 nameservers checked have an AAAA record, so IPv6-only resolvers can look the domain up. neil.ns.cloudflare.com ✓rafe.ns.cloudflare.com ✓	yes

HTTPS over IPv6 · not part of the grade yet
Loads over IPv6 with a valid certificate: HTTP 403.

https://microsoft365domain.com/ via 2606:4700:3033::ac43:ae12 → 403

works

Nothing keeping you from an A

Nothing to fix
Show it off: add the badge to your README.
[![IPv6](https://aaaa.bot/badge/microsoft365domain.com.svg)](https://aaaa.bot/microsoft365domain.com)

Check again

microsoft365domain.com Has IPv6

A (IPv4)	104.21.80.43 172.67.174.18
AAAA (IPv6)	2606:4700:3033::ac43:ae12 2606:4700:3036::6815:502b

www.microsoft365domain.com Has IPv6

A (IPv4)	104.21.80.43 172.67.174.18
AAAA (IPv6)	2606:4700:3033::ac43:ae12 2606:4700:3036::6815:502b

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: microsoft365domain.com
Measured 2026-10-31 19:01:41 UTC by aaaa.bot (one server on Fly.io, region iad)

A (IPv4):    104.21.80.43, 172.67.174.18
AAAA (IPv6): 2606:4700:3033::ac43:ae12, 2606:4700:3036::6815:502b
www AAAA:    2606:4700:3033::ac43:ae12, 2606:4700:3036::6815:502b

Readiness grade A: Website, mail and DNS all work over IPv6.
- Website over IPv6: microsoft365domain.com has 2 IPv6 addresses and answers on every one we tested.
    2606:4700:3033::ac43:ae12: answers (TCP 443)
    2606:4700:3036::6815:502b: answers (TCP 443)
- www over IPv6: www.microsoft365domain.com has 2 IPv6 addresses and answers on every one we tested.
    2606:4700:3033::ac43:ae12: answers (TCP 443)
    2606:4700:3036::6815:502b: answers (TCP 443)
- Mail servers (MX) have IPv6: Every mail server has an AAAA record.
- Nameservers have IPv6: 2 of 2 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): Loads over IPv6 with a valid certificate: HTTP 403.
    https://microsoft365domain.com/ via 2606:4700:3033::ac43:ae12 -> HTTP 403, certificate: valid
DNS answers via DNS-over-HTTPS (Cloudflare). Method: https://aaaa.bot/method
Permanent link: https://aaaa.bot/r/6VUVAGvI_n

Permanent link: aaaa.bot/r/6VUVAGvI_n · How we measure

Checked 2026-10-31 19:01:41 UTC. Full DNS report: dns.pizza/domain/microsoft365domain.com · JSON: /api/v1/microsoft365domain.com