Yes — opensec-lab.net 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
opensec-lab.net has an AAAA record and answers on it.
✓ 2001:41d0:301::30 answers · 443
yes
www over IPv6
www.opensec-lab.net has an AAAA record and answers on it.
✓ 2001:41d0:301::30 answers · 443
yes
Mail servers (MX) have IPv6
None of the mail servers has an AAAA record.
mx1.mail.ovh.net ✗mx2.mail.ovh.net ✗mx3.mail.ovh.net ✗
no
Nameservers have IPv6
2 of 2 nameservers checked have an AAAA record, so IPv6-only resolvers can look the domain up.
ns103.ovh.net ✓dns103.ovh.net ✓
yes
HTTPS over IPv6 · not part of the grade yet
The certificate served over IPv6 at 2001:41d0:301::30 isn't valid for opensec-lab.net: ERR_TLS_CERT_ALTNAME_INVALID.
https://opensec-lab.net/ via 2001:41d0:301::30 · ERR_TLS_CERT_ALTNAME_INVALID
problem
 Which outside scripts, fonts, payments or chat opensec-lab.net loads from have no IPv6.
 Load opensec-lab.net over IPv6 from up to six other places — a second opinion.

What's keeping opensec-lab.net from an A

  1. The certificate served over IPv6 is wrong
    The certificate served over IPv6 at 2001:41d0:301::30 isn't valid for opensec-lab.net: ERR_TLS_CERT_ALTNAME_INVALID. Often the IPv6 address points at a different server (or an old one) than IPv4 does. Make sure 2001:41d0:301::30 serves the same certificate as your IPv4 address.
  2. Mail servers without IPv6
    mx1.mail.ovh.net, mx2.mail.ovh.net, mx3.mail.ovh.net 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

opensec-lab.net  Has IPv6

A (IPv4)145.239.37.162
AAAA (IPv6)2001:41d0:301::30

www.opensec-lab.net  Has IPv6

A (IPv4)145.239.37.162
AAAA (IPv6)2001:41d0:301::30

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/YKXY8W194T · How we measure

Checked 2026-11-06 23:41:00 UTC. Full DNS report: dns.pizza/domain/opensec-lab.net · Age, certificate and blocklists: how.is/opensec-lab.net · JSON: /api/v1/opensec-lab.net