Yes — auth2.app has IPv6.

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

B
IPv6 readiness
Works over IPv6, with one gap: www doesn't fully work over IPv6.
Website over IPv6
auth2.app has 2 IPv6 addresses and answers on every one we tested.
✓ 2606:4700:3033::ac43:b58d answers · 443✓ 2606:4700:3030::6815:1260 answers · 443
yes
www over IPv6
www.auth2.app has no AAAA record.		no
Mail servers (MX) have IPv6
Every mail server has an AAAA record.
route1.mx.cloudflare.net ✓route2.mx.cloudflare.net ✓route3.mx.cloudflare.net ✓
yes
Nameservers have IPv6
2 of 2 nameservers checked have an AAAA record, so IPv6-only resolvers can look the domain up.
phoenix.ns.cloudflare.com ✓quentin.ns.cloudflare.com ✓
yes
HTTPS over IPv6 · not part of the grade yet
Loads over IPv6 with a valid certificate: HTTP 200.
https://auth2.app/ via 2606:4700:3033::ac43:b58d → 200
works
 Which outside scripts, fonts, payments or chat auth2.app loads from have no IPv6.
 Load auth2.app over IPv6 from up to six other places — a second opinion.

What's keeping auth2.app from an A

  1. Add IPv6 for www.auth2.app
    www.auth2.app has no AAAA record. Get www's IPv6 address from whoever hosts www and add it as an AAAA record. If the same server already serves both names (and its certificate covers www), you can reuse auth2.app's AAAA record(s) for www. How to add an AAAA record

Check again

auth2.app  Has IPv6

A (IPv4)172.67.181.141
104.21.18.96
AAAA (IPv6)2606:4700:3033::ac43:b58d
2606:4700:3030::6815:1260

www.auth2.app  No address

A (IPv4)none
AAAA (IPv6)none

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/Uc-zp7k_4b · How we measure

Checked 2026-11-07 23:03:31 UTC. Full DNS report: dns.pizza/domain/auth2.app · Age, certificate and blocklists: how.is/auth2.app · JSON: /api/v1/auth2.app