Yes — outlook-secure.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
outlook-secure.com has 4 IPv6 addresses and answers on every one we tested (4 more not tested).
✓ 2600:9000:24f2:6000:6:1b86:5b80:93a1 answers · 443✓ 2600:9000:24f2:c800:6:1b86:5b80:93a1 answers · 443✓ 2600:9000:24f2:9a00:6:1b86:5b80:93a1 answers · 443✓ 2600:9000:24f2:ca00:6:1b86:5b80:93a1 answers · 443– 2600:9000:24f2:3200:6:1b86:5b80:93a1 not tested– 2600:9000:24f2:a400:6:1b86:5b80:93a1 not tested– 2600:9000:24f2:8000:6:1b86:5b80:93a1 not tested– 2600:9000:24f2:f600:6:1b86:5b80:93a1 not tested
yes
www over IPv6
www.outlook-secure.com has 4 IPv6 addresses and answers on every one we tested (4 more not tested).
✓ 2600:9000:24f2:8a00:6:1b86:5b80:93a1 answers · 443✓ 2600:9000:24f2:800:6:1b86:5b80:93a1 answers · 443✓ 2600:9000:24f2:1a00:6:1b86:5b80:93a1 answers · 443✓ 2600:9000:24f2:7c00:6:1b86:5b80:93a1 answers · 443– 2600:9000:24f2:1600:6:1b86:5b80:93a1 not tested– 2600:9000:24f2:2800:6:1b86:5b80:93a1 not tested– 2600:9000:24f2:a000:6:1b86:5b80:93a1 not tested– 2600:9000:24f2:c400:6:1b86:5b80:93a1 not tested
yes
Mail servers (MX) have IPv6
None of the mail servers has an AAAA record.
mx3.secureemailhost.net ✗
no
Nameservers have IPv6
4 of 4 nameservers checked have an AAAA record, so IPv6-only resolvers can look the domain up.
ns-1285.awsdns-32.org ✓ns-1925.awsdns-48.co.uk ✓ns-494.awsdns-61.com ✓ns-699.awsdns-23.net ✓
yes
HTTPS over IPv6 · not part of the grade yet
Loads over IPv6 with a valid certificate: HTTP 404.
https://outlook-secure.com/ via 2600:9000:24f2:6000:6:1b86:5b80:93a1 → 404
works
 Which outside scripts, fonts, payments or chat outlook-secure.com loads from have no IPv6.
 Load outlook-secure.com over IPv6 from up to six other places — a second opinion.

What's keeping outlook-secure.com from an A

  1. Mail servers without IPv6
    mx3.secureemailhost.net 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

outlook-secure.com  Has IPv6

A (IPv4)18.160.41.59
18.160.41.129
18.160.41.124
18.160.41.28
AAAA (IPv6)2600:9000:24f2:6000:6:1b86:5b80:93a1
2600:9000:24f2:c800:6:1b86:5b80:93a1
2600:9000:24f2:9a00:6:1b86:5b80:93a1
2600:9000:24f2:ca00:6:1b86:5b80:93a1
2600:9000:24f2:3200:6:1b86:5b80:93a1
2600:9000:24f2:a400:6:1b86:5b80:93a1
2600:9000:24f2:8000:6:1b86:5b80:93a1
2600:9000:24f2:f600:6:1b86:5b80:93a1

www.outlook-secure.com  Has IPv6

A (IPv4)18.160.41.124
18.160.41.28
18.160.41.59
18.160.41.129
AAAA (IPv6)2600:9000:24f2:8a00:6:1b86:5b80:93a1
2600:9000:24f2:800:6:1b86:5b80:93a1
2600:9000:24f2:1a00:6:1b86:5b80:93a1
2600:9000:24f2:7c00:6:1b86:5b80:93a1
2600:9000:24f2:1600:6:1b86:5b80:93a1
2600:9000:24f2:2800:6:1b86:5b80:93a1
2600:9000:24f2:a000:6:1b86:5b80:93a1
2600:9000:24f2:c400:6:1b86:5b80:93a1

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/N6ubXzfG6w · How we measure

Checked 2026-11-13 01:13:23 UTC. Full DNS report: dns.pizza/domain/outlook-secure.com · Age, certificate and blocklists: how.is/outlook-secure.com · JSON: /api/v1/outlook-secure.com