Yes — criteo.com 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
criteo.com has 2 IPv6 addresses and answers on every one we tested.
✓ 2620:12a:8000::4 answers · 443✓ 2620:12a:8001::4 answers · 443
yes
www over IPv6
www.criteo.com has 2 IPv6 addresses and answers on every one we tested.
✓ 2620:12a:8001::4 answers · 443✓ 2620:12a:8000::4 answers · 443
yes
Mail servers (MX) have IPv6
Every mail server has an AAAA record.
criteo-com.o-v1.mx.microsoft ✓
yes
Nameservers have IPv6
No nameserver has an AAAA record — an IPv6-only resolver can't reach this domain's DNS.
ns1.criteo.com ✗ns2.criteo.com ✗
no
HTTPS over IPv6 · not part of the grade yet
Loads over IPv6 with a valid certificate after 1 redirect: HTTP 200.
https://criteo.com/ via 2620:12a:8000::4 → 301https://www.criteo.com/ via 2620:12a:8001::4 → 200
works
 Load criteo.com over IPv6 from up to six other places — a second opinion.

What's keeping criteo.com from an A

  1. Nameservers without IPv6
    ns1.criteo.com, ns2.criteo.com 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

criteo.com  Has IPv6

A (IPv4)23.185.0.4
AAAA (IPv6)2620:12a:8000::4
2620:12a:8001::4

www.criteo.com  Has IPv6

Alias ofcriteo.com
A (IPv4)23.185.0.4
AAAA (IPv6)2620:12a:8001::4
2620:12a:8000::4

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/wHh6lpJZwn · How we measure

Checked 2026-10-30 21:29:01 UTC. Full DNS report: dns.pizza/domain/criteo.com · JSON: /api/v1/criteo.com