Yes — vanttu.app has IPv6.

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

IPv6 readiness

Website, mail and DNS all work over IPv6.

Website over IPv6 vanttu.app has 2 IPv6 addresses and answers on every one we tested. ✓ 2606:4700:3031::ac43:da05 answers · 443✓ 2606:4700:3036::6815:2613 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. damon.ns.cloudflare.com ✓daphne.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://vanttu.app/ via 2606:4700:3031::ac43:da05 → 302https://solitary-mode-b77d.cloudflareaccess.com/cdn-cgi/access/login/vanttu.app?kid=def01bc85e2e149e3cd2eb6c04141d1a14eb4bab89bfc7e3c9ae73ef15dbfdcd&meta=eyJ0eXAiOiJKV1QiLCJhbGciOiJSUzI1NiIsImtpZCI6Ijg2OGFmMjMzMzMwYTk2ZmFjNTUzMTBhMmQyN2E2MmQ1ZWM1YWY5Zjg3ZDBhOTg5OTNhMzk0MjZlMDg1NGI2NzcifQ.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.VKUB26yjL8z55P4anGNBVY4zzGQuvn8e1duK2qfKYWbbs_VPTwLLzwnFbw-DkJbjLv_9PPGFN5HCsFtdh7OI-wVIQTyOHyslMmzBtc1_Bei0S7cQRGrj6trbT_Mn1oxqWo_QjszEKiX-pPB3UZKiJ_U6GfFwrkQwD9laOMPWuqtIwllVNkRNu-7qK_MPi1khkLWTmna6eZtPTBut5DDoW0UgupFcdzzhucsN1yebrlWBhFX5LzKsizCNmNFoSSavGkFSfewQDmCABqhdkjts2z5yxCa87Rig3eQ3qPUvxQcBU4MI5Tc5DtgVP2hCHiTevQtPUjQckhE2OuWMW9W-Kw&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/vanttu.app.svg)](https://aaaa.bot/vanttu.app)

Check again

vanttu.app Has IPv6

A (IPv4)	104.21.38.19 172.67.218.5
AAAA (IPv6)	2606:4700:3031::ac43:da05 2606:4700:3036::6815:2613

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: vanttu.app
Measured 2026-11-10 19:57:56 UTC by aaaa.bot (one server on Fly.io, region iad)

A (IPv4):    104.21.38.19, 172.67.218.5
AAAA (IPv6): 2606:4700:3031::ac43:da05, 2606:4700:3036::6815:2613

Readiness grade A: Website, mail and DNS all work over IPv6.
- Website over IPv6: vanttu.app has 2 IPv6 addresses and answers on every one we tested.
    2606:4700:3031::ac43:da05: answers (TCP 443)
    2606:4700:3036::6815:2613: 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 1 redirect: HTTP 200.
    https://vanttu.app/ via 2606:4700:3031::ac43:da05 -> HTTP 302, certificate: valid
    https://solitary-mode-b77d.cloudflareaccess.com/cdn-cgi/access/login/vanttu.app?kid=def01bc85e2e149e3cd2eb6c04141d1a14eb4bab89bfc7e3c9ae73ef15dbfdcd&meta=eyJ0eXAiOiJKV1QiLCJhbGciOiJSUzI1NiIsImtpZCI6Ijg2OGFmMjMzMzMwYTk2ZmFjNTUzMTBhMmQyN2E2MmQ1ZWM1YWY5Zjg3ZDBhOTg5OTNhMzk0MjZlMDg1NGI2NzcifQ.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.VKUB26yjL8z55P4anGNBVY4zzGQuvn8e1duK2qfKYWbbs_VPTwLLzwnFbw-DkJbjLv_9PPGFN5HCsFtdh7OI-wVIQTyOHyslMmzBtc1_Bei0S7cQRGrj6trbT_Mn1oxqWo_QjszEKiX-pPB3UZKiJ_U6GfFwrkQwD9laOMPWuqtIwllVNkRNu-7qK_MPi1khkLWTmna6eZtPTBut5DDoW0UgupFcdzzhucsN1yebrlWBhFX5LzKsizCNmNFoSSavGkFSfewQDmCABqhdkjts2z5yxCa87Rig3eQ3qPUvxQcBU4MI5Tc5DtgVP2hCHiTevQtPUjQckhE2OuWMW9W-Kw&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/pavxfrjLz3

Permanent link: aaaa.bot/r/pavxfrjLz3 · How we measure

Checked 2026-11-10 19:57:56 UTC. Full DNS report: dns.pizza/domain/vanttu.app · Age, certificate and blocklists: how.is/vanttu.app · JSON: /api/v1/vanttu.app