Yes — where-and-when.app has IPv6.

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

IPv6 readiness

Website, mail and DNS all work over IPv6.

Website over IPv6 where-and-when.app has 2 IPv6 addresses and answers on every one we tested. ✓ 2606:4700:3036::6815:9c0 answers · 443✓ 2606:4700:3034::ac43:bd87 answers · 443	yes
Mail servers (MX) have IPv6 Every mail server has an AAAA record. aspmx.l.google.com ✓alt3.aspmx.l.google.com ✓alt4.aspmx.l.google.com ✓alt1.aspmx.l.google.com ✓alt2.aspmx.l.google.com ✓	yes
Nameservers have IPv6 2 of 2 nameservers checked have an AAAA record, so IPv6-only resolvers can look the domain up. etienne.ns.cloudflare.com ✓ryleigh.ns.cloudflare.com ✓	yes

HTTPS over IPv6 · not part of the grade yet
Loads over IPv6 with a valid certificate after 1 redirect: HTTP 200.

https://where-and-when.app/ via 2606:4700:3036::6815:9c0 → 302https://still-hall-1e56.cloudflareaccess.com/cdn-cgi/access/login/where-and-when.app?kid=cf1f27bbd24267e7a5b710accc020698d22fea49ed80d25cf175336891762e28&meta=eyJ0eXAiOiJKV1QiLCJhbGciOiJSUzI1NiIsImtpZCI6IjY2NGJlMWExN2JjMjE0MzM3ZjRkNTliM2EzNmIyMTEzMDIyNGFjMWFlZGY3MGFhMGE0YjFmY2IwODQyNDQ0NTcifQ.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.jZffwSzpWS73jU0j8_xN91dVyVkBBCukX6Lj3EUWZs70CJVM-KAg1dm4N5qABij534-6CYw075dW31FEJBcoeTyqKPyz63MRe9ZzKMoSFfPIJ_CbmrUAi7IlZ9S_AsTB2Q2SccDGwjijHXvSQ2lXNoljbAFSn_j98Hvap22zLRTHJG055K5jx6nB6PvfVofJ5o5hmoOAojTtI45o4O6FypmnHKvaTwIgJ4Y6qr6S0hDsKt1thWLLF5B4Sa16a-gP_KXGs24mMkSOcL7zZ1eDp_ttqCxCx2-ZOwGa99Z9zx0KVikZVhJPvKFyBqrl2Su8uSRAxxNSjmMWUmpDRSUfsA&redirect_url=%2F via 2606:4700:300a::6813:c31d → 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/where-and-when.app.svg)](https://aaaa.bot/where-and-when.app)

Check again

where-and-when.app Has IPv6

A (IPv4)	172.67.189.135 104.21.9.192
AAAA (IPv6)	2606:4700:3036::6815:9c0 2606:4700:3034::ac43:bd87

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: where-and-when.app
Measured 2026-11-06 23:59:10 UTC by aaaa.bot (one server on Fly.io, region iad)

A (IPv4):    172.67.189.135, 104.21.9.192
AAAA (IPv6): 2606:4700:3036::6815:9c0, 2606:4700:3034::ac43:bd87

Readiness grade A: Website, mail and DNS all work over IPv6.
- Website over IPv6: where-and-when.app has 2 IPv6 addresses and answers on every one we tested.
    2606:4700:3036::6815:9c0: answers (TCP 443)
    2606:4700:3034::ac43:bd87: 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 after 1 redirect: HTTP 200.
    https://where-and-when.app/ via 2606:4700:3036::6815:9c0 -> HTTP 302, certificate: valid
    https://still-hall-1e56.cloudflareaccess.com/cdn-cgi/access/login/where-and-when.app?kid=cf1f27bbd24267e7a5b710accc020698d22fea49ed80d25cf175336891762e28&meta=eyJ0eXAiOiJKV1QiLCJhbGciOiJSUzI1NiIsImtpZCI6IjY2NGJlMWExN2JjMjE0MzM3ZjRkNTliM2EzNmIyMTEzMDIyNGFjMWFlZGY3MGFhMGE0YjFmY2IwODQyNDQ0NTcifQ.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.jZffwSzpWS73jU0j8_xN91dVyVkBBCukX6Lj3EUWZs70CJVM-KAg1dm4N5qABij534-6CYw075dW31FEJBcoeTyqKPyz63MRe9ZzKMoSFfPIJ_CbmrUAi7IlZ9S_AsTB2Q2SccDGwjijHXvSQ2lXNoljbAFSn_j98Hvap22zLRTHJG055K5jx6nB6PvfVofJ5o5hmoOAojTtI45o4O6FypmnHKvaTwIgJ4Y6qr6S0hDsKt1thWLLF5B4Sa16a-gP_KXGs24mMkSOcL7zZ1eDp_ttqCxCx2-ZOwGa99Z9zx0KVikZVhJPvKFyBqrl2Su8uSRAxxNSjmMWUmpDRSUfsA&redirect_url=%2F via 2606:4700:300a::6813:c31d -> HTTP 200, certificate: valid
DNS answers via DNS-over-HTTPS (Cloudflare). Method: https://aaaa.bot/method
Permanent link: https://aaaa.bot/r/QUDnihkB2x

Permanent link: aaaa.bot/r/QUDnihkB2x · How we measure

Checked 2026-11-06 23:59:10 UTC. Full DNS report: dns.pizza/domain/where-and-when.app · Age, certificate and blocklists: how.is/where-and-when.app · JSON: /api/v1/where-and-when.app