Yes — recaptcha.net has IPv6.

Has both IPv4 (A) and IPv6 (AAAA) addresses.

A
IPv6 readiness
Website, mail and DNS all work over IPv6.
Website over IPv6
recaptcha.net has an AAAA record and answers on it.
✓ 2607:f8b0:4004:c1b::5e answers · 443
yes
www over IPv6
www.recaptcha.net has an AAAA record and answers on it.
✓ 2607:f8b0:4004:c27::5e answers · 443
yes
Mail servers (MX) have IPv6
Every mail server has an AAAA record.
alt1.aspmx.l.google.com ✓aspmx2.googlemail.com ✓aspmx4.googlemail.com ✓aspmx.l.google.com ✓alt2.aspmx.l.google.com ✓aspmx5.googlemail.com ✓aspmx3.googlemail.com ✓
yes
Nameservers have IPv6
4 of 4 nameservers checked have an AAAA record, so IPv6-only resolvers can look the domain up.
ns4.google.com ✓ns3.google.com ✓ns1.google.com ✓ns2.google.com ✓
yes
HTTPS over IPv6 · not part of the grade yet
Loads over IPv6 with a valid certificate: HTTP 404.
https://recaptcha.net/ via 2607:f8b0:4004:c1b::5e → 404
works
 Load recaptcha.net over IPv6 from up to six other places — a second opinion.

Nothing keeping you from an A

  1. Nothing to fix
    Show it off: add the badge to your README.
    [![IPv6](https://aaaa.bot/badge/recaptcha.net.svg)](https://aaaa.bot/recaptcha.net)

Check again

recaptcha.net  Has IPv6

A (IPv4)172.253.62.94
AAAA (IPv6)2607:f8b0:4004:c1b::5e

www.recaptcha.net  Has IPv6

A (IPv4)192.178.218.94
AAAA (IPv6)2607:f8b0:4004:c27::5e

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/m7kmGlO-R4 · How we measure

Checked 2026-10-31 04:04:32 UTC — one of the top 1,000 sites, re-checked weekly. Re-check now. Full DNS report: dns.pizza/domain/recaptcha.net · JSON: /api/v1/recaptcha.net