Yes — openproofing.org has IPv6.

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

IPv6 readiness

Website, mail and DNS all work over IPv6.

Website over IPv6 openproofing.org has 3 IPv6 addresses and answers on every one we tested. ✓ 2606:4700:20::681a:e4a answers · 443✓ 2606:4700:20::ac43:4a36 answers · 443✓ 2606:4700:20::681a:f4a answers · 443	yes
www over IPv6 www.openproofing.org has 3 IPv6 addresses and answers on every one we tested. ✓ 2606:4700:20::ac43:4a36 answers · 443✓ 2606:4700:20::681a:e4a answers · 443✓ 2606:4700:20::681a:f4a answers · 443	yes
Mail servers (MX) have IPv6 Every mail server has an AAAA record. smtp.google.com ✓	yes
Nameservers have IPv6 2 of 2 nameservers checked have an AAAA record, so IPv6-only resolvers can look the domain up. aurora.ns.cloudflare.com ✓sri.ns.cloudflare.com ✓	yes

HTTPS over IPv6 · not part of the grade yet
Loads over IPv6 with a valid certificate: HTTP 200.

https://openproofing.org/ via 2606:4700:20::681a:e4a → 200

works

Nothing keeping you from an A

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

Check again

openproofing.org Has IPv6

A (IPv4)	172.67.74.54 104.26.15.74 104.26.14.74
AAAA (IPv6)	2606:4700:20::681a:e4a 2606:4700:20::ac43:4a36 2606:4700:20::681a:f4a

www.openproofing.org Has IPv6

A (IPv4)	172.67.74.54 104.26.14.74 104.26.15.74
AAAA (IPv6)	2606:4700:20::ac43:4a36 2606:4700:20::681a:e4a 2606:4700:20::681a:f4a

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

IPv6 measurement: openproofing.org
Measured 2026-11-07 17:13:49 UTC by aaaa.bot (one server on Fly.io, region iad)

A (IPv4):    172.67.74.54, 104.26.15.74, 104.26.14.74
AAAA (IPv6): 2606:4700:20::681a:e4a, 2606:4700:20::ac43:4a36, 2606:4700:20::681a:f4a
www AAAA:    2606:4700:20::ac43:4a36, 2606:4700:20::681a:e4a, 2606:4700:20::681a:f4a

Readiness grade A: Website, mail and DNS all work over IPv6.
- Website over IPv6: openproofing.org has 3 IPv6 addresses and answers on every one we tested.
    2606:4700:20::681a:e4a: answers (TCP 443)
    2606:4700:20::ac43:4a36: answers (TCP 443)
    2606:4700:20::681a:f4a: answers (TCP 443)
- www over IPv6: www.openproofing.org has 3 IPv6 addresses and answers on every one we tested.
    2606:4700:20::ac43:4a36: answers (TCP 443)
    2606:4700:20::681a:e4a: answers (TCP 443)
    2606:4700:20::681a:f4a: answers (TCP 443)
- Mail servers (MX) have IPv6: Every mail server has an AAAA record.
- Nameservers have IPv6: 2 of 2 nameservers checked have an AAAA record, so IPv6-only resolvers can look the domain up.

Reachability = a TCP connection opened on port 443 (or 80).

HTTPS over IPv6 (not graded): Loads over IPv6 with a valid certificate: HTTP 200.
    https://openproofing.org/ via 2606:4700:20::681a:e4a -> HTTP 200, certificate: valid
DNS answers via DNS-over-HTTPS (Cloudflare). Method: https://aaaa.bot/method
Permanent link: https://aaaa.bot/r/-29_ZS7N5m

Permanent link: aaaa.bot/r/-29_ZS7N5m · How we measure

Checked 2026-11-07 17:13:49 UTC. Full DNS report: dns.pizza/domain/openproofing.org · Age, certificate and blocklists: how.is/openproofing.org · JSON: /api/v1/openproofing.org