Yes — auth.univ-paris-diderot.fr 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
auth.univ-paris-diderot.fr has an AAAA record and answers on it.
✓ 2001:660:3301:8008::225 answers · 443
yes
Mail servers (MX) have IPv6
At least one mail server has no AAAA record (2 of 3 checked do).
korolev.univ-paris7.fr ✓potemkin.univ-paris7.fr ✓shiva.jussieu.fr ✗
partly
Nameservers have IPv6
2 of 3 nameservers checked have an AAAA record, so IPv6-only resolvers can look the domain up.
potemkin.univ-paris7.fr ✓shiva.jussieu.fr ✗korolev.univ-paris7.fr ✓
yes
HTTPS over IPv6 · not part of the grade yet
Loads over IPv6 with a valid certificate: HTTP 403.
https://auth.univ-paris-diderot.fr/ via 2001:660:3301:8008::225 → 403
works
 Load auth.univ-paris-diderot.fr over IPv6 from up to six other places — a second opinion.

What's keeping auth.univ-paris-diderot.fr from an A

  1. Mail servers without IPv6
    shiva.jussieu.fr 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

auth.univ-paris-diderot.fr  Has IPv6

Alias ofauth.dsi.univ-paris-diderot.fr
A (IPv4)81.194.22.225
AAAA (IPv6)2001:660:3301:8008::225

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/hfQ3icQ5Qo · How we measure

Checked 2026-11-01 15:37:05 UTC. Full DNS report: dns.pizza/domain/auth.univ-paris-diderot.fr · JSON: /api/v1/auth.univ-paris-diderot.fr