Yes — doubleprime.app has IPv6.

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

IPv6 readiness

Website, mail and DNS all work over IPv6.

Website over IPv6 doubleprime.app has 2 IPv6 addresses and answers on every one we tested. ✓ 2606:4700:3035::ac43:88a4 answers · 443✓ 2606:4700:3037::6815:4ec3 answers · 443	yes
www over IPv6 www.doubleprime.app has 2 IPv6 addresses and answers on every one we tested. ✓ 2606:4700:3037::6815:4ec3 answers · 443✓ 2606:4700:3035::ac43:88a4 answers · 443	yes
Mail servers (MX) have IPv6 No MX records, so mail goes to the domain's own address (implicit MX). It has an AAAA record.	yes
Nameservers have IPv6 2 of 2 nameservers checked have an AAAA record, so IPv6-only resolvers can look the domain up. meadow.ns.cloudflare.com ✓sevki.ns.cloudflare.com ✓	yes

HTTPS over IPv6 · not part of the grade yet
Loads over IPv6 with a valid certificate after 2 redirects: HTTP 200.

https://doubleprime.app/ via 2606:4700:3035::ac43:88a4 → 302https://plasma.doubleprime.app/ via 2606:4700:3037::6815:4ec3 → 302https://floral-cake-0c7e.cloudflareaccess.com/cdn-cgi/access/login/plasma.doubleprime.app?kid=70f4f15648ef99331a82179f12214b3ca91a48d187b27350a8627bec820104c9&meta=eyJ0eXAiOiJKV1QiLCJhbGciOiJSUzI1NiIsImtpZCI6IjkyNjFmMGYwMmYwOThhYTQzYmVkOGUzMDc1OWI0ZDdjNGVjYmIwZGRlMGFiMjZkODNhZmFmM2JjNDk1MzE5ZmMifQ.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.Ie1_gUE-AqYmlnsQL66o9uyUGZlW5aSLfLSrp3t2lJi-2MjqAv8XVs7uLtLqa-OOVyjKsFPN4NcHSS0-sA_1OZAM7AgxSMly20Q-uliwhC_LJr6eSdNaCw5OuSYDYg9j6vmTrV2nzBPHaUDNqt6nZ7B0HBM2Rbj8Fw_N4e_0Nu9QkIwvRCxlLbb4ySuUfxK5K5f0JBK0zhGLs0XYj7gTVybHxlOOGK-ijXx7KkSAwT8Sm7eX3eaoBMagzmLIAGlFmg2LSKiLLFUI_z1shJ3PHcas3YPEKZjKr0Xib3EuDxe380kaJ4cUhlDCryTNW-IPmhnHqXNF9kqD9qyBmax1hQ&redirect_url=%2F via 2606:4700:300a::6813:c21d → 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/doubleprime.app.svg)](https://aaaa.bot/doubleprime.app)

Check again

doubleprime.app Has IPv6

A (IPv4)	172.67.136.164 104.21.78.195
AAAA (IPv6)	2606:4700:3035::ac43:88a4 2606:4700:3037::6815:4ec3

www.doubleprime.app Has IPv6

A (IPv4)	172.67.136.164 104.21.78.195
AAAA (IPv6)	2606:4700:3037::6815:4ec3 2606:4700:3035::ac43:88a4

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: doubleprime.app
Measured 2026-11-06 01:39:25 UTC by aaaa.bot (one server on Fly.io, region iad)

A (IPv4):    172.67.136.164, 104.21.78.195
AAAA (IPv6): 2606:4700:3035::ac43:88a4, 2606:4700:3037::6815:4ec3
www AAAA:    2606:4700:3037::6815:4ec3, 2606:4700:3035::ac43:88a4

Readiness grade A: Website, mail and DNS all work over IPv6.
- Website over IPv6: doubleprime.app has 2 IPv6 addresses and answers on every one we tested.
    2606:4700:3035::ac43:88a4: answers (TCP 443)
    2606:4700:3037::6815:4ec3: answers (TCP 443)
- www over IPv6: www.doubleprime.app has 2 IPv6 addresses and answers on every one we tested.
    2606:4700:3037::6815:4ec3: answers (TCP 443)
    2606:4700:3035::ac43:88a4: answers (TCP 443)
- Mail servers (MX) have IPv6: No MX records, so mail goes to the domain's own address (implicit MX). It 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 2 redirects: HTTP 200.
    https://doubleprime.app/ via 2606:4700:3035::ac43:88a4 -> HTTP 302, certificate: valid
    https://plasma.doubleprime.app/ via 2606:4700:3037::6815:4ec3 -> HTTP 302, certificate: valid
    https://floral-cake-0c7e.cloudflareaccess.com/cdn-cgi/access/login/plasma.doubleprime.app?kid=70f4f15648ef99331a82179f12214b3ca91a48d187b27350a8627bec820104c9&meta=eyJ0eXAiOiJKV1QiLCJhbGciOiJSUzI1NiIsImtpZCI6IjkyNjFmMGYwMmYwOThhYTQzYmVkOGUzMDc1OWI0ZDdjNGVjYmIwZGRlMGFiMjZkODNhZmFmM2JjNDk1MzE5ZmMifQ.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.Ie1_gUE-AqYmlnsQL66o9uyUGZlW5aSLfLSrp3t2lJi-2MjqAv8XVs7uLtLqa-OOVyjKsFPN4NcHSS0-sA_1OZAM7AgxSMly20Q-uliwhC_LJr6eSdNaCw5OuSYDYg9j6vmTrV2nzBPHaUDNqt6nZ7B0HBM2Rbj8Fw_N4e_0Nu9QkIwvRCxlLbb4ySuUfxK5K5f0JBK0zhGLs0XYj7gTVybHxlOOGK-ijXx7KkSAwT8Sm7eX3eaoBMagzmLIAGlFmg2LSKiLLFUI_z1shJ3PHcas3YPEKZjKr0Xib3EuDxe380kaJ4cUhlDCryTNW-IPmhnHqXNF9kqD9qyBmax1hQ&redirect_url=%2F via 2606:4700:300a::6813:c21d -> HTTP 200, certificate: valid
DNS answers via DNS-over-HTTPS (Cloudflare). Method: https://aaaa.bot/method
Permanent link: https://aaaa.bot/r/PZM975gCkX

Permanent link: aaaa.bot/r/PZM975gCkX · How we measure

Checked 2026-11-06 01:39:25 UTC. Full DNS report: dns.pizza/domain/doubleprime.app · Age, certificate and blocklists: how.is/doubleprime.app · JSON: /api/v1/doubleprime.app