Yes — acrobits.cz has IPv6.

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

Measured 2026-11-04 18:37 UTC. We reuse a result for up to a week, so we aren't testing the same site over and over. Check acrobits.cz now

IPv6 readiness

Website, mail and DNS all work over IPv6.

Website over IPv6 acrobits.cz has an AAAA record and answers on it. ✓ 2604:a880:400:d0::8ea:9001 answers · 443	yes
www over IPv6 www.acrobits.cz has an AAAA record and answers on it. ✓ 2604:a880:400:d0::8ea:9001 answers · 443	yes
Mail servers (MX) have IPv6 Every mail server has an AAAA record. aspmx.l.google.com ✓alt1.aspmx.l.google.com ✓alt2.aspmx.l.google.com ✓aspmx2.googlemail.com ✓aspmx3.googlemail.com ✓aspmx4.googlemail.com ✓aspmx5.googlemail.com ✓	yes
Nameservers have IPv6 2 of 2 nameservers checked have an AAAA record, so IPv6-only resolvers can look the domain up. cash.ns.cloudflare.com ✓rita.ns.cloudflare.com ✓	yes

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

HTTPS over IPv6 · not part of the grade yet
Redirects to acrobits.net, which has no IPv6 address — so IPv6 visitors end up needing IPv4 after all.

https://acrobits.cz/ via 2604:a880:400:d0::8ea:9001 → 301https://acrobits.net/ · redirects to acrobits.net, which has no IPv6 address

problem

Nothing keeping you from an A

A redirect leads off IPv6
Redirects to acrobits.net, which has no IPv6 address — so IPv6 visitors end up needing IPv4 after all. Give the redirect target IPv6 too, or redirect somewhere that has it.

Check again

acrobits.cz Has IPv6

A (IPv4)	198.199.66.56
AAAA (IPv6)	2604:a880:400:d0::8ea:9001

www.acrobits.cz Has IPv6

Alias of	acrobits.cz
A (IPv4)	198.199.66.56
AAAA (IPv6)	2604:a880:400:d0::8ea:9001

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: acrobits.cz
Measured 2026-11-04 18:37:26 UTC by aaaa.bot (one server on Fly.io, region iad)

A (IPv4):    198.199.66.56
AAAA (IPv6): 2604:a880:400:d0::8ea:9001
www AAAA:    2604:a880:400:d0::8ea:9001

Readiness grade A: Website, mail and DNS all work over IPv6.
- Website over IPv6: acrobits.cz has an AAAA record and answers on it.
    2604:a880:400:d0::8ea:9001: answers (TCP 443)
- www over IPv6: www.acrobits.cz has an AAAA record and answers on it.
    2604:a880:400:d0::8ea:9001: 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): Redirects to acrobits.net, which has no IPv6 address — so IPv6 visitors end up needing IPv4 after all.
    https://acrobits.cz/ via 2604:a880:400:d0::8ea:9001 -> HTTP 301, certificate: valid
    https://acrobits.net/ (redirects to acrobits.net, which has no IPv6 address)
DNS answers via DNS-over-HTTPS (Cloudflare). Method: https://aaaa.bot/method
Permanent link: https://aaaa.bot/r/2aJRzqR1iQ

Permanent link: aaaa.bot/r/2aJRzqR1iQ · How we measure

Checked 2026-11-04 18:37:26 UTC. Full DNS report: dns.pizza/domain/acrobits.cz · Age, certificate and blocklists: how.is/acrobits.cz · JSON: /api/v1/acrobits.cz