Yes — curia.fyi has IPv6.

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

IPv6 readiness

Website, mail and DNS all work over IPv6.

Website over IPv6 curia.fyi has 2 IPv6 addresses and answers on every one we tested. ✓ 2606:4700:3032::6815:429e answers · 443✓ 2606:4700:3033::ac43:a183 answers · 443	yes
Mail servers (MX) have IPv6 Every mail server has an AAAA record. route1.mx.cloudflare.net ✓route2.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. keira.ns.cloudflare.com ✓lex.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://curia.fyi/ via 2606:4700:3032::6815:429e → 302https://weathered-shadow-598e.cloudflareaccess.com/cdn-cgi/access/login/curia.fyi?kid=28c29f34e7f7e107c2ec7e4f4c718e11397f1f83b268b8314cccc6e05909f189&meta=eyJ0eXAiOiJKV1QiLCJhbGciOiJSUzI1NiIsImtpZCI6Ijk1NzAyZmQ0M2E5YWNlYzAwZmJmZDRlZmJlMzUzNzRmMGQwYTViZjZjMDgxYzEwYWQ0OGQ5NzNmNWQ3ZTJlMDQifQ.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.gteDsOKqL82B2taBBbPqTP8Nyg0Sc656JpmKWREbinWs5Bm64hL88h_GGgpaxMVU7t5ihamecl3K14EaSZ6TUCqj2dT5cM4U_Bs5LUmQz7idgVZYBqQrS4p4ZAZpPWgTGFOAa19xtypPdOpAekbOsutZC4FIBFcINKp3yjmKG3GxV5R4nAKi3cw9uUHjZazRnqwZazQHr7QEf66xpJYPy_OIa0OYhQOasbk9PVQY4QDjD4yxFxW7IHc_Qjp7YSJpB-dytPUrKaVKCPXSexnPiq4vBuq2co71lXEP0CN3FEHvN9xlb78-zu1fZ-7KCIZc4uLk08NZsQixJNVibFn7wA&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/curia.fyi.svg)](https://aaaa.bot/curia.fyi)

Check again

curia.fyi Has IPv6

A (IPv4)	172.67.161.131 104.21.66.158
AAAA (IPv6)	2606:4700:3032::6815:429e 2606:4700:3033::ac43:a183

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: curia.fyi
Measured 2026-11-07 01:47:24 UTC by aaaa.bot (one server on Fly.io, region iad)

A (IPv4):    172.67.161.131, 104.21.66.158
AAAA (IPv6): 2606:4700:3032::6815:429e, 2606:4700:3033::ac43:a183

Readiness grade A: Website, mail and DNS all work over IPv6.
- Website over IPv6: curia.fyi has 2 IPv6 addresses and answers on every one we tested.
    2606:4700:3032::6815:429e: answers (TCP 443)
    2606:4700:3033::ac43:a183: 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://curia.fyi/ via 2606:4700:3032::6815:429e -> HTTP 302, certificate: valid
    https://weathered-shadow-598e.cloudflareaccess.com/cdn-cgi/access/login/curia.fyi?kid=28c29f34e7f7e107c2ec7e4f4c718e11397f1f83b268b8314cccc6e05909f189&meta=eyJ0eXAiOiJKV1QiLCJhbGciOiJSUzI1NiIsImtpZCI6Ijk1NzAyZmQ0M2E5YWNlYzAwZmJmZDRlZmJlMzUzNzRmMGQwYTViZjZjMDgxYzEwYWQ0OGQ5NzNmNWQ3ZTJlMDQifQ.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.gteDsOKqL82B2taBBbPqTP8Nyg0Sc656JpmKWREbinWs5Bm64hL88h_GGgpaxMVU7t5ihamecl3K14EaSZ6TUCqj2dT5cM4U_Bs5LUmQz7idgVZYBqQrS4p4ZAZpPWgTGFOAa19xtypPdOpAekbOsutZC4FIBFcINKp3yjmKG3GxV5R4nAKi3cw9uUHjZazRnqwZazQHr7QEf66xpJYPy_OIa0OYhQOasbk9PVQY4QDjD4yxFxW7IHc_Qjp7YSJpB-dytPUrKaVKCPXSexnPiq4vBuq2co71lXEP0CN3FEHvN9xlb78-zu1fZ-7KCIZc4uLk08NZsQixJNVibFn7wA&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/NnpIWHq2Gc

Permanent link: aaaa.bot/r/NnpIWHq2Gc · How we measure

Checked 2026-11-07 01:47:24 UTC. Full DNS report: dns.pizza/domain/curia.fyi · Age, certificate and blocklists: how.is/curia.fyi · JSON: /api/v1/curia.fyi