Yes — avonet.cz has IPv6.

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

B
IPv6 readiness
Works over IPv6, with one gap: its mail servers lack IPv6.
Website over IPv6
avonet.cz has an AAAA record and answers on it.
✓ 2a00:6500:0:11::eb:0 answers · 443
yes
www over IPv6
www.avonet.cz has an AAAA record and answers on it.
✓ 2a00:6500:0:11::eb:0 answers · 443
yes
Mail servers (MX) have IPv6
At least one mail server has no AAAA record (1 of 3 checked do).
ms.avonet.cz ✓mx1.avonet.cz ✗spool.avonet.cz ✗
partly
Nameservers have IPv6
3 of 3 nameservers checked have an AAAA record, so IPv6-only resolvers can look the domain up.
ns.avonet.cz ✓sns.avonet.cz ✓tns.avonet.cz ✓
yes

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

HTTPS over IPv6 · not part of the grade yet
Loads over IPv6 with a valid certificate: HTTP 200.
https://avonet.cz/ via 2a00:6500:0:11::eb:0 → 200
works
 Which outside scripts, fonts, payments or chat avonet.cz loads from have no IPv6.
 Load avonet.cz over IPv6 from up to six other places — a second opinion.

What's keeping avonet.cz from an A

  1. Mail servers without IPv6
    mx1.avonet.cz, spool.avonet.cz have no AAAA record, so mail from IPv6-only servers can't reach them directly. If a provider runs your mail, that's their setting; if you run it, add AAAA records for these hosts.

Check again

avonet.cz  Has IPv6

A (IPv4)217.112.162.40
AAAA (IPv6)2a00:6500:0:11::eb:0

www.avonet.cz  Has IPv6

Alias ofvirt.avonet.cz
A (IPv4)217.112.162.40
AAAA (IPv6)2a00:6500:0:11::eb:0

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

 Permanent link: aaaa.bot/r/QF0KrGkYcW · How we measure

Checked 2026-11-15 15:48:12 UTC. Full DNS report: dns.pizza/domain/avonet.cz · Age, certificate and blocklists: how.is/avonet.cz · JSON: /api/v1/avonet.cz