Yes — ifortuna.cz has IPv6.

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

Measured 2026-11-13 19:34 UTC. We reuse a result for up to a week, so we aren't testing the same site over and over. Check ifortuna.cz now

IPv6 readiness

Works over IPv6, with one gap: its mail servers lack IPv6.

Website over IPv6 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
www over IPv6 www.ifortuna.cz has 2 IPv6 addresses and answers on every one we tested. ✓ 2a06:98c1:3105::ac40:92fa answers · 443✓ 2a06:98c1:3101::6812:2906 answers · 443	yes
Mail servers (MX) have IPv6 At least one mail server has no AAAA record (1 of 2 checked do). ifortuna-cz.mail.protection.outlook.com ✓mx.email-messaging.com ✗	partly
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

First measured 2026-11-04; last confirmed 2026-11-13.

HTTPS over IPv6 · not part of the grade yet
Loads over IPv6 with a valid certificate after 1 redirect: HTTP 200.

https://ifortuna.cz/ via 2a06:98c1:3101::6812:2906 → 301https://www.ifortuna.cz/ via 2a06:98c1:3105::ac40:92fa → 200

works

What's keeping ifortuna.cz from an A

Mail servers without IPv6
mx.email-messaging.com has no AAAA record, so mail from IPv6-only servers can't reach it directly. If a provider runs your mail, that's their setting; if you run it, add AAAA records for these hosts.

Check again

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

www.ifortuna.cz Has IPv6

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

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: ifortuna.cz
Measured 2026-11-13 19:34:53 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
www AAAA:    2a06:98c1:3105::ac40:92fa, 2a06:98c1:3101::6812:2906

Readiness grade B: Works over IPv6, with one gap: its mail servers lack IPv6.
- Website over IPv6: 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)
- www over IPv6: www.ifortuna.cz has 2 IPv6 addresses and answers on every one we tested.
    2a06:98c1:3105::ac40:92fa: answers (TCP 443)
    2a06:98c1:3101::6812:2906: answers (TCP 443)
- Mail servers (MX) have IPv6: At least one mail server has no AAAA record (1 of 2 checked do).
- 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://ifortuna.cz/ via 2a06:98c1:3101::6812:2906 -> HTTP 301, certificate: valid
    https://www.ifortuna.cz/ via 2a06:98c1:3105::ac40:92fa -> HTTP 200, certificate: valid
DNS answers via DNS-over-HTTPS (Cloudflare). Method: https://aaaa.bot/method
Permanent link: https://aaaa.bot/r/y4lKmfTkmw

Permanent link: aaaa.bot/r/y4lKmfTkmw · How we measure

Checked 2026-11-13 19:34:53 UTC. Full DNS report: dns.pizza/domain/ifortuna.cz · Age, certificate and blocklists: how.is/ifortuna.cz · JSON: /api/v1/ifortuna.cz