Yes — outlook.rtp.pt has IPv6.

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

B
IPv6 readiness
Works over IPv6, with one gap: its nameservers lack IPv6.
Website over IPv6
outlook.rtp.pt has 4 IPv6 addresses and answers on every one we tested (4 more not tested).
✓ 2603:1036:207:459::2 answers · 443✓ 2603:1036:207:45c::2 answers · 443✓ 2603:1036:302:415c::2 answers · 443✓ 2603:1036:302:415d::2 answers · 443– 2603:1036:302:415f::2 not tested– 2603:1036:302:4830::2 not tested– 2603:1036:302:4836::2 not tested– 2603:1036:302:505d::2 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
No nameserver has an AAAA record — an IPv6-only resolver can't reach this domain's DNS.
ns2.ptempresas.pt ✗ns10.ptempresas.pt ✗ns1.ptempresas.pt ✗
no
HTTPS over IPv6 · not part of the grade yet
The certificate served over IPv6 at 2603:1036:207:459::2 isn't valid for outlook.rtp.pt: ERR_TLS_CERT_ALTNAME_INVALID.
https://outlook.rtp.pt/ via 2603:1036:207:459::2 · ERR_TLS_CERT_ALTNAME_INVALID
problem
 Which outside scripts, fonts, payments or chat outlook.rtp.pt loads from have no IPv6.
 Load outlook.rtp.pt over IPv6 from up to six other places — a second opinion.

What's keeping outlook.rtp.pt from an A

  1. The certificate served over IPv6 is wrong
    The certificate served over IPv6 at 2603:1036:207:459::2 isn't valid for outlook.rtp.pt: ERR_TLS_CERT_ALTNAME_INVALID. Often the IPv6 address points at a different server (or an old one) than IPv4 does. Make sure 2603:1036:207:459::2 serves the same certificate as your IPv4 address.
  2. Nameservers without IPv6
    ns2.ptempresas.pt, ns10.ptempresas.pt, ns1.ptempresas.pt all have no AAAA record, so a resolver that only speaks IPv6 can't look your domain up. Most DNS providers offer IPv6 nameservers; ask yours, or move DNS to one that does.

Check again

outlook.rtp.pt  Has IPv6

Alias ofoutlook.office365.com → outlook.cloud.microsoft → atm.outlook.mira.tm.svc.cloud.microsoft
A (IPv4)40.99.232.114
40.104.16.226
40.104.46.82
40.104.47.98
52.96.87.242
52.96.88.114
52.96.109.146
52.96.181.34
AAAA (IPv6)2603:1036:207:459::2
2603:1036:207:45c::2
2603:1036:302:415c::2
2603:1036:302:415d::2
2603:1036:302:415f::2
2603:1036:302:4830::2
2603:1036:302:4836::2
2603:1036:302:505d::2

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/_whpjh1alh · How we measure

Checked 2026-11-15 17:02:27 UTC. Full DNS report: dns.pizza/domain/outlook.rtp.pt · Age, certificate and blocklists: how.is/outlook.rtp.pt · JSON: /api/v1/outlook.rtp.pt