Yes — sjddev.fyi has IPv6.

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

IPv6 readiness

Website, mail and DNS all work over IPv6.

Website over IPv6 sjddev.fyi has 2 IPv6 addresses and answers on every one we tested. ✓ 2606:4700:3033::ac43:8f7e answers · 443✓ 2606:4700:3032::6815:5f46 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. bowen.ns.cloudflare.com ✓riya.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://sjddev.fyi/ via 2606:4700:3033::ac43:8f7e → 302https://sjddev.cloudflareaccess.com/cdn-cgi/access/login/sjddev.fyi?kid=4252f4be552bdf4b92af95c01c163a66e5d0396a9dd4a715a58f2cfd52b03293&meta=eyJ0eXAiOiJKV1QiLCJhbGciOiJSUzI1NiIsImtpZCI6ImY5YTM0NzhlYmJiMmI0ZTA5MTY2M2U2NTgxZWU0MDliZWU1OTg2MjUxOTlmMTI4ZjdmZmIwNTdlNmU0YTQ4YTUifQ.eyJ0eXBlIjoibWV0YSIsImF1ZCI6IjQyNTJmNGJlNTUyYmRmNGI5MmFmOTVjMDFjMTYzYTY2ZTVkMDM5NmE5ZGQ0YTcxNWE1OGYyY2ZkNTJiMDMyOTMiLCJob3N0bmFtZSI6InNqZGRldi5meWkiLCJyZWRpcmVjdF91cmwiOiIvIiwic2VydmljZV90b2tlbl9zdGF0dXMiOmZhbHNlLCJpc193YXJwIjpmYWxzZSwiaXNfZ2F0ZXdheSI6ZmFsc2UsImV4cCI6MTc5NDQ1NjUzMywibmJmIjoxNzk0NDU2MjMzLCJpYXQiOjE3OTQ0NTYyMzMsImF1dGhfc3RhdHVzIjoiTk9ORSIsIm10bHNfYXV0aCI6eyJjZXJ0X2lzc3Vlcl9kbiI6IiIsImNlcnRfc2VyaWFsIjoiIiwiY2VydF9pc3N1ZXJfc2tpIjoiIiwiY2VydF9wcmVzZW50ZWQiOmZhbHNlLCJjb21tb25fbmFtZSI6IiIsImF1dGhfc3RhdHVzIjoiTk9ORSJ9LCJyZWFsX2NvdW50cnkiOiJVUyIsImFwcF9zZXNzaW9uX2hhc2giOiJlODQ1NThjODc3ODczOGMwYTkwZjkzYzAzNTNhNTNjMjkyYTBmY2E4M2RjNjhkZDM4OTdlZTlkOTZlYmY2ZmRmIn0.eNl_rpqSyJ9a6lMftCUlPTfkHRACD6onZQ6vW0zp3eiz_T5HwDoxf3motXL5oxrsdqUIdQP6OupqBTgAmTyMSEZ5QQ1q2euw7HSyTv2gXe11aYYozWS1RJ1zuojaus4e3yZhkfD7OTwGgsEsvdYmCGuPQcrU_zfmAucWZSnKK26lEPzni-XzxKY8DXTYvhVD-yp15Egpvoo-9TUqN8G_1f6tWxjNu5xXh1ASmgCOK15DSUw50qwJ4dIulhqj7AjCMD-JgfEIHC8zh_3iQWlbIc8efvG1G17cWUblPQIk4o58Zkba4UifIizXjcB8BomQrUO_F2LQCrBFnOPd-L9kSw&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/sjddev.fyi.svg)](https://aaaa.bot/sjddev.fyi)

Check again

sjddev.fyi Has IPv6

A (IPv4)	172.67.143.126 104.21.95.70
AAAA (IPv6)	2606:4700:3033::ac43:8f7e 2606:4700:3032::6815:5f46

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: sjddev.fyi
Measured 2026-11-12 04:03:53 UTC by aaaa.bot (one server on Fly.io, region iad)

A (IPv4):    172.67.143.126, 104.21.95.70
AAAA (IPv6): 2606:4700:3033::ac43:8f7e, 2606:4700:3032::6815:5f46

Readiness grade A: Website, mail and DNS all work over IPv6.
- Website over IPv6: sjddev.fyi has 2 IPv6 addresses and answers on every one we tested.
    2606:4700:3033::ac43:8f7e: answers (TCP 443)
    2606:4700:3032::6815:5f46: 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://sjddev.fyi/ via 2606:4700:3033::ac43:8f7e -> HTTP 302, certificate: valid
    https://sjddev.cloudflareaccess.com/cdn-cgi/access/login/sjddev.fyi?kid=4252f4be552bdf4b92af95c01c163a66e5d0396a9dd4a715a58f2cfd52b03293&meta=eyJ0eXAiOiJKV1QiLCJhbGciOiJSUzI1NiIsImtpZCI6ImY5YTM0NzhlYmJiMmI0ZTA5MTY2M2U2NTgxZWU0MDliZWU1OTg2MjUxOTlmMTI4ZjdmZmIwNTdlNmU0YTQ4YTUifQ.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.eNl_rpqSyJ9a6lMftCUlPTfkHRACD6onZQ6vW0zp3eiz_T5HwDoxf3motXL5oxrsdqUIdQP6OupqBTgAmTyMSEZ5QQ1q2euw7HSyTv2gXe11aYYozWS1RJ1zuojaus4e3yZhkfD7OTwGgsEsvdYmCGuPQcrU_zfmAucWZSnKK26lEPzni-XzxKY8DXTYvhVD-yp15Egpvoo-9TUqN8G_1f6tWxjNu5xXh1ASmgCOK15DSUw50qwJ4dIulhqj7AjCMD-JgfEIHC8zh_3iQWlbIc8efvG1G17cWUblPQIk4o58Zkba4UifIizXjcB8BomQrUO_F2LQCrBFnOPd-L9kSw&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/bk-bT9Kn2F

Permanent link: aaaa.bot/r/bk-bT9Kn2F · How we measure

Checked 2026-11-12 04:03:53 UTC. Full DNS report: dns.pizza/domain/sjddev.fyi · Age, certificate and blocklists: how.is/sjddev.fyi · JSON: /api/v1/sjddev.fyi