No — office365.com is IPv4 only.

Has an IPv4 address but no IPv6 (AAAA) record. IPv6-only visitors can't reach it directly.

IPv6 readiness

The website has no IPv6.

Website over IPv6 office365.com has no AAAA record.	no
www over IPv6 www.office365.com has no AAAA record.	no
Mail servers (MX) have IPv6 No MX records, so mail goes to the domain's own address (implicit MX). It has no AAAA record.	no
Nameservers have IPv6 4 of 4 nameservers checked have an AAAA record, so IPv6-only resolvers can look the domain up. ns1-07.azure-dns.com ✓ns2-07.azure-dns.net ✓ns3-07.azure-dns.org ✓ns4-07.azure-dns.info ✓	yes

What's keeping office365.com from an A

Give office365.com an IPv6 address
Ask your hosting provider for the site's IPv6 address (or the hostname to point at), then publish it as an AAAA record. If your host doesn't offer IPv6, a proxy that does can sit in front. How to add an AAAA record
www.office365.com is an alias of office365.com, which has no IPv6
www.office365.com is a CNAME, so it can't also have its own AAAA record. Ask whoever runs office365.com to enable IPv6 there — or replace the alias with the A and AAAA records they give you. Why some hosts don't offer IPv6
Mail servers without IPv6
Your domain's mail goes to its own address, which has no AAAA record.

Check again

office365.com IPv4 only

A (IPv4)	40.112.243.53 20.119.0.28
AAAA (IPv6)	none

www.office365.com IPv4 only

Alias of	office365.com
A (IPv4)	20.119.0.28 40.112.243.53
AAAA (IPv6)	none

What this means

Visitors on IPv6-only networks (many mobile carriers) can still reach it, but only through a translator their carrier runs (NAT64). The site itself has no IPv6 address — and you can't make one up from the IPv4. Why some hosts don't offer it

Copy the evidence — a citation-ready record of this measurement

IPv6 measurement: office365.com
Measured 2026-10-30 17:04:30 UTC by aaaa.bot (one server on Fly.io, region iad)

A (IPv4):    40.112.243.53, 20.119.0.28
AAAA (IPv6): none
www AAAA:    none

Readiness grade D: The website has no IPv6.
- Website over IPv6: office365.com has no AAAA record.
- www over IPv6: www.office365.com has no AAAA record.
- Mail servers (MX) have IPv6: No MX records, so mail goes to the domain's own address (implicit MX). It has no AAAA record.
- Nameservers have IPv6: 4 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).
No TLS or HTTP request was made.
DNS answers via DNS-over-HTTPS (Cloudflare). Method: https://aaaa.bot/method
Permanent link: https://aaaa.bot/r/2AuiN1n7_R

Permanent link: aaaa.bot/r/2AuiN1n7_R · How we measure

Checked 2026-10-30 17:04:30 UTC — one of the top 1,000 sites, re-checked weekly. Re-check now. Full DNS report: dns.pizza/domain/office365.com · JSON: /api/v1/office365.com