Yes — castreview.studio has IPv6.

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

IPv6 readiness

Website, mail and DNS all work over IPv6.

Website over IPv6 castreview.studio has 2 IPv6 addresses and answers on every one we tested. ✓ 2606:4700:3036::ac43:a29f answers · 443✓ 2606:4700:3036::6815:f7f answers · 443	yes
Mail servers (MX) have IPv6 Every mail server has an AAAA record. route2.mx.cloudflare.net ✓route1.mx.cloudflare.net ✓route3.mx.cloudflare.net ✓	yes
Nameservers have IPv6 2 of 2 nameservers checked have an AAAA record, so IPv6-only resolvers can look the domain up. gerardo.ns.cloudflare.com ✓serena.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://castreview.studio/ via 2606:4700:3036::ac43:a29f → 302https://divine-violet-f9a7.cloudflareaccess.com/cdn-cgi/access/login/castreview.studio?kid=4df3adf855a0d74c49f1236de6258003854b8a9b82bbd394e2e3002bb8ac66ee&meta=eyJ0eXAiOiJKV1QiLCJhbGciOiJSUzI1NiIsImtpZCI6Ijg2OGFmMjMzMzMwYTk2ZmFjNTUzMTBhMmQyN2E2MmQ1ZWM1YWY5Zjg3ZDBhOTg5OTNhMzk0MjZlMDg1NGI2NzcifQ.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.DAEJuLGB9vGh6BijPG8osWXhUxGmqKQLQKGpM7wQlVf3iLNWPzozfs4ptUP3JrGBZloy_yCujqTcuy7xWIvy3Pv1DDKgF-mwkJOt6OzxQnDjnRbEqoVZJqS3IHg9q1u10fYFYXve1OmqL-Gzfz8SzLpRapH4OM-tNaW92UsOeKbDJTsiyCbNjk_--3LWgtpRhIvm_vDTozidcn9vqu6YOf9r57yKFOFVItRPXV063USdQDIhTBfnrkQ0I7JXLsJu6zArBgZbzW3h-D6jxE0cvO-YNy6XsjeqjsWV9T7TSjrdWQJBn3btRvOB2pD4IwdrkGk_zGMtHHoJUB31-ELR-g&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/castreview.studio.svg)](https://aaaa.bot/castreview.studio)

Check again

castreview.studio Has IPv6

A (IPv4)	172.67.162.159 104.21.15.127
AAAA (IPv6)	2606:4700:3036::ac43:a29f 2606:4700:3036::6815:f7f

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: castreview.studio
Measured 2026-11-13 03:51:54 UTC by aaaa.bot (one server on Fly.io, region iad)

A (IPv4):    172.67.162.159, 104.21.15.127
AAAA (IPv6): 2606:4700:3036::ac43:a29f, 2606:4700:3036::6815:f7f

Readiness grade A: Website, mail and DNS all work over IPv6.
- Website over IPv6: castreview.studio has 2 IPv6 addresses and answers on every one we tested.
    2606:4700:3036::ac43:a29f: answers (TCP 443)
    2606:4700:3036::6815:f7f: answers (TCP 443)
- Mail servers (MX) have IPv6: Every mail server 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://castreview.studio/ via 2606:4700:3036::ac43:a29f -> HTTP 302, certificate: valid
    https://divine-violet-f9a7.cloudflareaccess.com/cdn-cgi/access/login/castreview.studio?kid=4df3adf855a0d74c49f1236de6258003854b8a9b82bbd394e2e3002bb8ac66ee&meta=eyJ0eXAiOiJKV1QiLCJhbGciOiJSUzI1NiIsImtpZCI6Ijg2OGFmMjMzMzMwYTk2ZmFjNTUzMTBhMmQyN2E2MmQ1ZWM1YWY5Zjg3ZDBhOTg5OTNhMzk0MjZlMDg1NGI2NzcifQ.eyJ0eXBlIjoibWV0YSIsImF1ZCI6IjRkZjNhZGY4NTVhMGQ3NGM0OWYxMjM2ZGU2MjU4MDAzODU0YjhhOWI4MmJiZDM5NGUyZTMwMDJiYjhhYzY2ZWUiLCJob3N0bmFtZSI6ImNhc3RyZXZpZXcuc3R1ZGlvIiwicmVkaXJlY3RfdXJsIjoiLyIsInNlcnZpY2VfdG9rZW5fc3RhdHVzIjpmYWxzZSwiaXNfd2FycCI6ZmFsc2UsImlzX2dhdGV3YXkiOmZhbHNlLCJleHAiOjE3OTQ1NDIyMTUsIm5iZiI6MTc5NDU0MTkxNSwiaWF0IjoxNzk0NTQxOTE1LCJhdXRoX3N0YXR1cyI6Ik5PTkUiLCJtdGxzX2F1dGgiOnsiY2VydF9pc3N1ZXJfZG4iOiIiLCJjZXJ0X3NlcmlhbCI6IiIsImNlcnRfaXNzdWVyX3NraSI6IiIsImNlcnRfcHJlc2VudGVkIjpmYWxzZSwiY29tbW9uX25hbWUiOiIiLCJhdXRoX3N0YXR1cyI6Ik5PTkUifSwicmVhbF9jb3VudHJ5IjoiVVMiLCJhcHBfc2Vzc2lvbl9oYXNoIjoiNjM0NDM5ZjMzZDE5NTcwY2IzZWRlMTc5OGJmNjg3YTE4OWE0NWMxYjhhNmZmMjkxZmUwOGQzNmMwOWNlNDU2NSJ9.DAEJuLGB9vGh6BijPG8osWXhUxGmqKQLQKGpM7wQlVf3iLNWPzozfs4ptUP3JrGBZloy_yCujqTcuy7xWIvy3Pv1DDKgF-mwkJOt6OzxQnDjnRbEqoVZJqS3IHg9q1u10fYFYXve1OmqL-Gzfz8SzLpRapH4OM-tNaW92UsOeKbDJTsiyCbNjk_--3LWgtpRhIvm_vDTozidcn9vqu6YOf9r57yKFOFVItRPXV063USdQDIhTBfnrkQ0I7JXLsJu6zArBgZbzW3h-D6jxE0cvO-YNy6XsjeqjsWV9T7TSjrdWQJBn3btRvOB2pD4IwdrkGk_zGMtHHoJUB31-ELR-g&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/J5pxl_3VbW

Permanent link: aaaa.bot/r/J5pxl_3VbW · How we measure

Checked 2026-11-13 03:51:54 UTC. Full DNS report: dns.pizza/domain/castreview.studio · Age, certificate and blocklists: how.is/castreview.studio · JSON: /api/v1/castreview.studio