Yes — windows.com has IPv6.

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

B
IPv6 readiness
Works over IPv6, with one gap: its mail servers lack IPv6.
Website over IPv6
windows.com has 4 IPv6 addresses and answers on every one we tested (1 more not tested).
✓ 2603:1010:3:3::5b answers · 443✓ 2603:1030:c02:8::14 answers · 443✓ 2603:1020:201:10::10f answers · 443✓ 2603:1030:20e:3::23c answers · 443– 2603:1030:b:3::152 not tested
yes
www over IPv6
www.windows.com has 4 IPv6 addresses and answers on every one we tested (1 more not tested).
✓ 2603:1010:3:3::5b answers · 443✓ 2603:1030:c02:8::14 answers · 443✓ 2603:1020:201:10::10f answers · 443✓ 2603:1030:20e:3::23c answers · 443– 2603:1030:b:3::152 not tested
yes
Mail servers (MX) have IPv6
None of the mail servers has an AAAA record.
mail.windows.com ✗
no
Nameservers have IPv6
4 of 4 nameservers checked have an AAAA record, so IPv6-only resolvers can look the domain up.
ns1-205.azure-dns.com ✓ns2-205.azure-dns.net ✓ns3-205.azure-dns.org ✓ns4-205.azure-dns.info ✓
yes
HTTPS over IPv6 · not part of the grade yet
Redirects to windows.microsoft.com, which has no IPv6 address — so IPv6 visitors end up needing IPv4 after all.
https://windows.com/ via 2603:1010:3:3::5b → 301https://windows.microsoft.com/ · redirects to windows.microsoft.com, which has no IPv6 address
problem
 Load windows.com over IPv6 from up to six other places — a second opinion.

What's keeping windows.com from an A

  1. A redirect leads off IPv6
    Redirects to windows.microsoft.com, which has no IPv6 address — so IPv6 visitors end up needing IPv4 after all. Give the redirect target IPv6 too, or redirect somewhere that has it.
  2. Mail servers without IPv6
    mail.windows.com has no AAAA record, so mail from IPv6-only servers can't reach it directly. If a provider runs your mail, that's their setting; if you run it, add AAAA records for these hosts.

Check again

windows.com  Has IPv6

A (IPv4)20.70.246.20
20.76.201.171
20.112.250.133
20.236.44.162
20.231.239.246
AAAA (IPv6)2603:1010:3:3::5b
2603:1030:c02:8::14
2603:1020:201:10::10f
2603:1030:20e:3::23c
2603:1030:b:3::152

www.windows.com  Has IPv6

Alias ofwindows.com
A (IPv4)20.76.201.171
20.112.250.133
20.236.44.162
20.231.239.246
20.70.246.20
AAAA (IPv6)2603:1010:3:3::5b
2603:1030:c02:8::14
2603:1020:201:10::10f
2603:1030:20e:3::23c
2603:1030:b:3::152

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/MPvGujzRxI · How we measure

Checked 2026-10-30 17:04:31 UTC — one of the top 1,000 sites, re-checked weekly. Re-check now. Full DNS report: dns.pizza/domain/windows.com · JSON: /api/v1/windows.com