Yes — 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
univ-paris-diderot.fr has an AAAA record and answers on it.
✓ 2001:660:3301:8008::239 answers · 443
yes
www over IPv6
www.univ-paris-diderot.fr has an AAAA record and answers on it.
✓ 2001:660:3301:8008::239 answers · 443
yes
Mail servers (MX) have IPv6
None of the mail servers has an AAAA record.
mx2.relay.renater.fr ✗mx1.relay.renater.fr ✗
no
Nameservers have IPv6
2 of 3 nameservers checked have an AAAA record, so IPv6-only resolvers can look the domain up.
korolev.univ-paris7.fr ✓shiva.jussieu.fr ✗potemkin.univ-paris7.fr ✓
yes
HTTPS over IPv6 · not part of the grade yet
Redirects to u-paris.fr, which has no IPv6 address — so IPv6 visitors end up needing IPv4 after all.
https://univ-paris-diderot.fr/ via 2001:660:3301:8008::239 → 301https://u-paris.fr/ · redirects to u-paris.fr, which has no IPv6 address
problem
 Load univ-paris-diderot.fr over IPv6 from up to six other places — a second opinion.

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

  1. A redirect leads off IPv6
    Redirects to u-paris.fr, 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
    mx2.relay.renater.fr, mx1.relay.renater.fr have no AAAA record, so mail from IPv6-only servers can't reach them directly. If a provider runs your mail, that's their setting; if you run it, add AAAA records for these hosts.

Check again

univ-paris-diderot.fr  Has IPv6

A (IPv4)81.194.22.239
AAAA (IPv6)2001:660:3301:8008::239

www.univ-paris-diderot.fr  Has IPv6

Alias ofrpnp1.dsi.univ-paris-diderot.fr
A (IPv4)81.194.22.239
AAAA (IPv6)2001:660:3301:8008::239

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/3MvFPFONXz · How we measure

Checked 2026-11-01 12:07:32 UTC. Full DNS report: dns.pizza/domain/univ-paris-diderot.fr · JSON: /api/v1/univ-paris-diderot.fr