Yes — mycortex.fyi has IPv6.

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

IPv6 readiness

Website, mail and DNS all work over IPv6.

Website over IPv6 mycortex.fyi has 2 IPv6 addresses and answers on every one we tested. ✓ 2606:4700:3037::ac43:9a88 answers · 443✓ 2606:4700:3033::6815:50e3 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. aldo.ns.cloudflare.com ✓braelyn.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://mycortex.fyi/ via 2606:4700:3037::ac43:9a88 → 302https://flat-snow-318b.cloudflareaccess.com/cdn-cgi/access/login/mycortex.fyi?kid=5fa6a59d869cbdc9a7fbc88a29263199a3e2f4502227f584b076e576a87ae4bd&meta=eyJ0eXAiOiJKV1QiLCJhbGciOiJSUzI1NiIsImtpZCI6Ijg2OGFmMjMzMzMwYTk2ZmFjNTUzMTBhMmQyN2E2MmQ1ZWM1YWY5Zjg3ZDBhOTg5OTNhMzk0MjZlMDg1NGI2NzcifQ.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.lxCuyd1HxzY_v361TgCbhuLt9jgl_Fesl91KNHDvJ3oqrMsFFXl2acmKN2ZjjCJ3_S8F-IKCpOrCepcZ0fH2WxM4Gqv83O-Ym9SSHbJJp5MmDM6rmSfEeaTCZ9PSjsn1jdnwUuGIu7cSju9wN_OaoFseiCPEZYSvaVnhNmtO4ClQBVeozIgBep8dM-Kk77e07Xdh3ixKQp6IGgmRm8Ubjc0Z0ZSrauKgZAEtbPImWRVy5oPJHT3hppiGU3j-jxjKBhW5d8etJKvqipd1E2owlbqyRm-8wCXW9-YB4SVe_mXDQcBuivdrN99GFNUoWutAaP_s3b812eMb91icVpoN_g&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/mycortex.fyi.svg)](https://aaaa.bot/mycortex.fyi)

Check again

mycortex.fyi Has IPv6

A (IPv4)	172.67.154.136 104.21.80.227
AAAA (IPv6)	2606:4700:3037::ac43:9a88 2606:4700:3033::6815:50e3

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: mycortex.fyi
Measured 2026-11-11 04:57:26 UTC by aaaa.bot (one server on Fly.io, region iad)

A (IPv4):    172.67.154.136, 104.21.80.227
AAAA (IPv6): 2606:4700:3037::ac43:9a88, 2606:4700:3033::6815:50e3

Readiness grade A: Website, mail and DNS all work over IPv6.
- Website over IPv6: mycortex.fyi has 2 IPv6 addresses and answers on every one we tested.
    2606:4700:3037::ac43:9a88: answers (TCP 443)
    2606:4700:3033::6815:50e3: 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://mycortex.fyi/ via 2606:4700:3037::ac43:9a88 -> HTTP 302, certificate: valid
    https://flat-snow-318b.cloudflareaccess.com/cdn-cgi/access/login/mycortex.fyi?kid=5fa6a59d869cbdc9a7fbc88a29263199a3e2f4502227f584b076e576a87ae4bd&meta=eyJ0eXAiOiJKV1QiLCJhbGciOiJSUzI1NiIsImtpZCI6Ijg2OGFmMjMzMzMwYTk2ZmFjNTUzMTBhMmQyN2E2MmQ1ZWM1YWY5Zjg3ZDBhOTg5OTNhMzk0MjZlMDg1NGI2NzcifQ.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.lxCuyd1HxzY_v361TgCbhuLt9jgl_Fesl91KNHDvJ3oqrMsFFXl2acmKN2ZjjCJ3_S8F-IKCpOrCepcZ0fH2WxM4Gqv83O-Ym9SSHbJJp5MmDM6rmSfEeaTCZ9PSjsn1jdnwUuGIu7cSju9wN_OaoFseiCPEZYSvaVnhNmtO4ClQBVeozIgBep8dM-Kk77e07Xdh3ixKQp6IGgmRm8Ubjc0Z0ZSrauKgZAEtbPImWRVy5oPJHT3hppiGU3j-jxjKBhW5d8etJKvqipd1E2owlbqyRm-8wCXW9-YB4SVe_mXDQcBuivdrN99GFNUoWutAaP_s3b812eMb91icVpoN_g&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/Hx2_ho1h7j

Permanent link: aaaa.bot/r/Hx2_ho1h7j · How we measure

Checked 2026-11-11 04:57:26 UTC. Full DNS report: dns.pizza/domain/mycortex.fyi · Age, certificate and blocklists: how.is/mycortex.fyi · JSON: /api/v1/mycortex.fyi