Yes — candid-dev.fyi has IPv6.

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

IPv6 readiness

Website, mail and DNS all work over IPv6.

Website over IPv6 candid-dev.fyi has 2 IPv6 addresses and answers on every one we tested. ✓ 2606:4700:3033::6815:5f76 answers · 443✓ 2606:4700:3034::ac43:90be answers · 443	yes
www over IPv6 www.candid-dev.fyi has 2 IPv6 addresses and answers on every one we tested. ✓ 2606:4700:3033::6815:5f76 answers · 443✓ 2606:4700:3034::ac43:90be 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. carioca.ns.cloudflare.com ✓rohin.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://candid-dev.fyi/ via 2606:4700:3033::6815:5f76 → 302https://super-resonance-24f0.cloudflareaccess.com/cdn-cgi/access/login/candid-dev.fyi?kid=4d6fe6cb644ce4ca265583bea42610f8f8676c526d97a29b8be735ec55db90bd&meta=eyJ0eXAiOiJKV1QiLCJhbGciOiJSUzI1NiIsImtpZCI6Ijg2OGFmMjMzMzMwYTk2ZmFjNTUzMTBhMmQyN2E2MmQ1ZWM1YWY5Zjg3ZDBhOTg5OTNhMzk0MjZlMDg1NGI2NzcifQ.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.gJmTO1S22gvvY9nCLWZTAEwOL5aOcDtRh7QZwlGw4h9FmjrbU2f9w9bOVuaNBRs6BHW8aHrG_bWun4gBjnu0pt-rUqSn3EIsxh7JCx-byvPqnbt5SBdEZ9sccRD0Ea1Py_QHnxDX7vEd4iNzTFLKoMUDJpkQY_ec7J-_7mrtLDDgzBS9pJe8csKy3ZEcTAVoJFgOYA1K-JOja2TxZppFRCdD1ObTWCp77neasliSVeVlr_7nbLUW8N-lWP5r7xeprVFcV8UnqdWAAV78X-3Dz9s40KdnF6bHyeqJJ5wxmW-Vtlg3zQLjvPy7-GoEJuUdC90W4HV2Y7yHFIVEVCoiGA&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/candid-dev.fyi.svg)](https://aaaa.bot/candid-dev.fyi)

Check again

candid-dev.fyi Has IPv6

A (IPv4)	172.67.144.190 104.21.95.118
AAAA (IPv6)	2606:4700:3033::6815:5f76 2606:4700:3034::ac43:90be

www.candid-dev.fyi Has IPv6

A (IPv4)	172.67.144.190 104.21.95.118
AAAA (IPv6)	2606:4700:3033::6815:5f76 2606:4700:3034::ac43:90be

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: candid-dev.fyi
Measured 2026-11-08 02:32:30 UTC by aaaa.bot (one server on Fly.io, region iad)

A (IPv4):    172.67.144.190, 104.21.95.118
AAAA (IPv6): 2606:4700:3033::6815:5f76, 2606:4700:3034::ac43:90be
www AAAA:    2606:4700:3033::6815:5f76, 2606:4700:3034::ac43:90be

Readiness grade A: Website, mail and DNS all work over IPv6.
- Website over IPv6: candid-dev.fyi has 2 IPv6 addresses and answers on every one we tested.
    2606:4700:3033::6815:5f76: answers (TCP 443)
    2606:4700:3034::ac43:90be: answers (TCP 443)
- www over IPv6: www.candid-dev.fyi has 2 IPv6 addresses and answers on every one we tested.
    2606:4700:3033::6815:5f76: answers (TCP 443)
    2606:4700:3034::ac43:90be: 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://candid-dev.fyi/ via 2606:4700:3033::6815:5f76 -> HTTP 302, certificate: valid
    https://super-resonance-24f0.cloudflareaccess.com/cdn-cgi/access/login/candid-dev.fyi?kid=4d6fe6cb644ce4ca265583bea42610f8f8676c526d97a29b8be735ec55db90bd&meta=eyJ0eXAiOiJKV1QiLCJhbGciOiJSUzI1NiIsImtpZCI6Ijg2OGFmMjMzMzMwYTk2ZmFjNTUzMTBhMmQyN2E2MmQ1ZWM1YWY5Zjg3ZDBhOTg5OTNhMzk0MjZlMDg1NGI2NzcifQ.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.gJmTO1S22gvvY9nCLWZTAEwOL5aOcDtRh7QZwlGw4h9FmjrbU2f9w9bOVuaNBRs6BHW8aHrG_bWun4gBjnu0pt-rUqSn3EIsxh7JCx-byvPqnbt5SBdEZ9sccRD0Ea1Py_QHnxDX7vEd4iNzTFLKoMUDJpkQY_ec7J-_7mrtLDDgzBS9pJe8csKy3ZEcTAVoJFgOYA1K-JOja2TxZppFRCdD1ObTWCp77neasliSVeVlr_7nbLUW8N-lWP5r7xeprVFcV8UnqdWAAV78X-3Dz9s40KdnF6bHyeqJJ5wxmW-Vtlg3zQLjvPy7-GoEJuUdC90W4HV2Y7yHFIVEVCoiGA&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/6RdlbmQZZm

Permanent link: aaaa.bot/r/6RdlbmQZZm · How we measure

Checked 2026-11-08 02:32:30 UTC. Full DNS report: dns.pizza/domain/candid-dev.fyi · Age, certificate and blocklists: how.is/candid-dev.fyi · JSON: /api/v1/candid-dev.fyi