Yes — docs.ifortuna.cz has IPv6.

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

IPv6 readiness

Website, mail and DNS all work over IPv6.

Website over IPv6 docs.ifortuna.cz has 2 IPv6 addresses and answers on every one we tested. ✓ 2a06:98c1:3101::6812:2906 answers · 443✓ 2a06:98c1:3105::ac40:92fa 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. kipp.ns.cloudflare.com ✓zara.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://docs.ifortuna.cz/ via 2a06:98c1:3101::6812:2906 → 302https://efortuna.cloudflareaccess.com/cdn-cgi/access/login/docs.ifortuna.cz?kid=d71fa42330480750873111e1df24e8f6fef226e3edaa9b3094271e5c2cec431f&meta=eyJ0eXAiOiJKV1QiLCJhbGciOiJSUzI1NiIsImtpZCI6IjkzMzVlZTAwNThjMTE2ZmQ3N2I0NDUxMmNmZmFlNTMwNzU4Y2I4MzMzNmFmNDk3M2Q0OGFmZGY4N2M4MjhlMDgifQ.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.UyziNAvn3-S8w-vWnbd7UHWQ2nlel7Z4OQRrKVutcFG3hfC1fWsUXhhNvrVxG8NxWJQxJgxwxHb0y0Mpq_3jGanhKgnjf7hnf11qbDQON45uVeSebwGAYP56p1YLpUHA85DpQvq0xHTl997Tsoi0fIOTCxFd2o8-9ku0W5ApQd15ue4i0uOsTirXg8P_1J4HgYJ4JMVmITQBWk-y88IqByk0Qz6rQ2gJDZA0fJ6_NMco4vR-54C97-qsfEXGnfeyBHFn08gUsX4a1Q6yt8P6ApmdWem862SFsXRQi3r_z8G1joeRoVzJDMi2saIWgH0-dy4zblzc_bpOXBPbWsbCMw&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/docs.ifortuna.cz.svg)](https://aaaa.bot/docs.ifortuna.cz)

Check again

docs.ifortuna.cz Has IPv6

A (IPv4)	104.18.41.6 172.64.146.250
AAAA (IPv6)	2a06:98c1:3101::6812:2906 2a06:98c1:3105::ac40:92fa

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: docs.ifortuna.cz
Measured 2026-11-15 17:27:59 UTC by aaaa.bot (one server on Fly.io, region iad)

A (IPv4):    104.18.41.6, 172.64.146.250
AAAA (IPv6): 2a06:98c1:3101::6812:2906, 2a06:98c1:3105::ac40:92fa

Readiness grade A: Website, mail and DNS all work over IPv6.
- Website over IPv6: docs.ifortuna.cz has 2 IPv6 addresses and answers on every one we tested.
    2a06:98c1:3101::6812:2906: answers (TCP 443)
    2a06:98c1:3105::ac40:92fa: 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://docs.ifortuna.cz/ via 2a06:98c1:3101::6812:2906 -> HTTP 302, certificate: valid
    https://efortuna.cloudflareaccess.com/cdn-cgi/access/login/docs.ifortuna.cz?kid=d71fa42330480750873111e1df24e8f6fef226e3edaa9b3094271e5c2cec431f&meta=eyJ0eXAiOiJKV1QiLCJhbGciOiJSUzI1NiIsImtpZCI6IjkzMzVlZTAwNThjMTE2ZmQ3N2I0NDUxMmNmZmFlNTMwNzU4Y2I4MzMzNmFmNDk3M2Q0OGFmZGY4N2M4MjhlMDgifQ.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.UyziNAvn3-S8w-vWnbd7UHWQ2nlel7Z4OQRrKVutcFG3hfC1fWsUXhhNvrVxG8NxWJQxJgxwxHb0y0Mpq_3jGanhKgnjf7hnf11qbDQON45uVeSebwGAYP56p1YLpUHA85DpQvq0xHTl997Tsoi0fIOTCxFd2o8-9ku0W5ApQd15ue4i0uOsTirXg8P_1J4HgYJ4JMVmITQBWk-y88IqByk0Qz6rQ2gJDZA0fJ6_NMco4vR-54C97-qsfEXGnfeyBHFn08gUsX4a1Q6yt8P6ApmdWem862SFsXRQi3r_z8G1joeRoVzJDMi2saIWgH0-dy4zblzc_bpOXBPbWsbCMw&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/CJexJy-Qo_

Permanent link: aaaa.bot/r/CJexJy-Qo_ · How we measure

Checked 2026-11-15 17:27:59 UTC. Full DNS report: dns.pizza/domain/docs.ifortuna.cz · Age, certificate and blocklists: how.is/docs.ifortuna.cz · JSON: /api/v1/docs.ifortuna.cz