Yes — ubuntu.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
ubuntu.com has 3 IPv6 addresses and answers on every one we tested.
✓ 2620:2d:4000:1::27 answers · 443✓ 2620:2d:4000:1::28 answers · 443✓ 2620:2d:4000:1::26 answers · 443
yes
www over IPv6
www.ubuntu.com has 3 IPv6 addresses and answers on every one we tested.
✓ 2620:2d:4000:1::26 answers · 443✓ 2620:2d:4000:1::28 answers · 443✓ 2620:2d:4000:1::27 answers · 443
yes
Mail servers (MX) have IPv6
None of the mail servers has an AAAA record.
mx.ubuntu.com ✗
no
Nameservers have IPv6
2 of 3 nameservers checked have an AAAA record, so IPv6-only resolvers can look the domain up.
ns2.canonical.com ✓ns3.canonical.com ✗ns1.canonical.com ✓
yes
HTTPS over IPv6 · not part of the grade yet
Loads over IPv6 with a valid certificate: HTTP 200.
https://ubuntu.com/ via 2620:2d:4000:1::27 → 200
works
 Load ubuntu.com over IPv6 from up to six other places — a second opinion.

What's keeping ubuntu.com from an A

  1. Mail servers without IPv6
    mx.ubuntu.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

ubuntu.com  Has IPv6

A (IPv4)185.125.190.21
185.125.190.29
185.125.190.20
AAAA (IPv6)2620:2d:4000:1::27
2620:2d:4000:1::28
2620:2d:4000:1::26

www.ubuntu.com  Has IPv6

A (IPv4)185.125.190.21
185.125.190.20
185.125.190.29
AAAA (IPv6)2620:2d:4000:1::26
2620:2d:4000:1::28
2620:2d:4000:1::27

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/QfhnaDjZ2V · How we measure

Checked 2026-10-30 23:42:09 UTC. Full DNS report: dns.pizza/domain/ubuntu.com · JSON: /api/v1/ubuntu.com