Yes — aicertlab.dev has IPv6.

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

IPv6 readiness

Website, mail and DNS all work over IPv6.

Website over IPv6 aicertlab.dev has 2 IPv6 addresses and answers on every one we tested. ✓ 2606:4700:3033::ac43:98cd answers · 443✓ 2606:4700:3037::6815:280 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. sasha.ns.cloudflare.com ✓trace.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://aicertlab.dev/ via 2606:4700:3033::ac43:98cd → 302https://delicate-tooth-b54a.cloudflareaccess.com/cdn-cgi/access/login/aicertlab.dev?kid=1c70b3d96a4f14c9543f36d852a2104ed5a577d414825337ff58e52b174334e3&meta=eyJ0eXAiOiJKV1QiLCJhbGciOiJSUzI1NiIsImtpZCI6Ijg2OGFmMjMzMzMwYTk2ZmFjNTUzMTBhMmQyN2E2MmQ1ZWM1YWY5Zjg3ZDBhOTg5OTNhMzk0MjZlMDg1NGI2NzcifQ.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.d833d-6x8ZiF1kzkQxpytQbAdM861DmRO2NCCoyqgBEjN2HE0VycT4OFfFv4tMhNIDZLyBOCAWfeClPEpcpAFGAjWoKNkpd7ccH3k2TdhJmg6l8q6HbeFIekYW7xXk1OmMR5lGPmOQjA70z2EkLHeKVywka0kqw4Acn74tJceusGPuZdw_cq7TS6GtPQYeh-9UFQhtk5YvMFKA7GVvUcwxHGhvIq2znfkzKKKDV6Nm9moaAzI6pSH2I-_-YjaS8FKG9pGD4pvgbG4oGRkokGoXXmmHaEO224Ie9meahEKZeQe8ZMHk_9uxKaKH7OqTmifC--h6wWEiwfkolJVvQpjA&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/aicertlab.dev.svg)](https://aaaa.bot/aicertlab.dev)

Check again

aicertlab.dev Has IPv6

A (IPv4)	104.21.2.128 172.67.152.205
AAAA (IPv6)	2606:4700:3033::ac43:98cd 2606:4700:3037::6815:280

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: aicertlab.dev
Measured 2026-11-03 21:54:16 UTC by aaaa.bot (one server on Fly.io, region iad)

A (IPv4):    104.21.2.128, 172.67.152.205
AAAA (IPv6): 2606:4700:3033::ac43:98cd, 2606:4700:3037::6815:280

Readiness grade A: Website, mail and DNS all work over IPv6.
- Website over IPv6: aicertlab.dev has 2 IPv6 addresses and answers on every one we tested.
    2606:4700:3033::ac43:98cd: answers (TCP 443)
    2606:4700:3037::6815:280: 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://aicertlab.dev/ via 2606:4700:3033::ac43:98cd -> HTTP 302, certificate: valid
    https://delicate-tooth-b54a.cloudflareaccess.com/cdn-cgi/access/login/aicertlab.dev?kid=1c70b3d96a4f14c9543f36d852a2104ed5a577d414825337ff58e52b174334e3&meta=eyJ0eXAiOiJKV1QiLCJhbGciOiJSUzI1NiIsImtpZCI6Ijg2OGFmMjMzMzMwYTk2ZmFjNTUzMTBhMmQyN2E2MmQ1ZWM1YWY5Zjg3ZDBhOTg5OTNhMzk0MjZlMDg1NGI2NzcifQ.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.d833d-6x8ZiF1kzkQxpytQbAdM861DmRO2NCCoyqgBEjN2HE0VycT4OFfFv4tMhNIDZLyBOCAWfeClPEpcpAFGAjWoKNkpd7ccH3k2TdhJmg6l8q6HbeFIekYW7xXk1OmMR5lGPmOQjA70z2EkLHeKVywka0kqw4Acn74tJceusGPuZdw_cq7TS6GtPQYeh-9UFQhtk5YvMFKA7GVvUcwxHGhvIq2znfkzKKKDV6Nm9moaAzI6pSH2I-_-YjaS8FKG9pGD4pvgbG4oGRkokGoXXmmHaEO224Ie9meahEKZeQe8ZMHk_9uxKaKH7OqTmifC--h6wWEiwfkolJVvQpjA&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/OpHwVNE5NU

Permanent link: aaaa.bot/r/OpHwVNE5NU · How we measure

Checked 2026-11-03 21:54:16 UTC. Full DNS report: dns.pizza/domain/aicertlab.dev · Age, certificate and blocklists: how.is/aicertlab.dev · JSON: /api/v1/aicertlab.dev