No — blesk.cz is IPv4 only.

Has an IPv4 address but no IPv6 (AAAA) record. IPv6-only visitors can't reach it directly.

This is a saved measurement from 2026-11-05 16:00 UTC. Check blesk.cz live now

D
IPv6 readiness
The website has no IPv6.
Website over IPv6
blesk.cz has no AAAA record.		no
www over IPv6
www.blesk.cz has no AAAA record.		no
Mail servers (MX) have IPv6
At least one mail server has no AAAA record (5 of 7 checked do).
aspmx.l.google.com ✓onlinedev.cncenter.cz ✗onlineweb.cncenter.cz ✗alt1.aspmx.l.google.com ✓alt2.aspmx.l.google.com ✓aspmx2.googlemail.com ✓aspmx3.googlemail.com ✓
partly
Nameservers have IPv6
2 of 2 nameservers checked have an AAAA record, so IPv6-only resolvers can look the domain up.
josephine.ns.cloudflare.com ✓rick.ns.cloudflare.com ✓
yes

What's keeping blesk.cz from an A

  1. Give blesk.cz and www.blesk.cz an IPv6 address
    Ask your hosting provider for the site's IPv6 address (or the hostname to point at), then publish it as an AAAA record. If your host doesn't offer IPv6, a proxy that does can sit in front. How to add an AAAA record
  2. Mail servers without IPv6
    onlinedev.cncenter.cz, onlineweb.cncenter.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

blesk.cz  IPv4 only

A (IPv4)91.235.52.165
AAAA (IPv6)none

www.blesk.cz  IPv4 only

Alias ofblesk.cz
A (IPv4)91.235.52.165
AAAA (IPv6)none

What this means

Visitors on IPv6-only networks (many mobile carriers) can still reach it, but only through a translator their carrier runs (NAT64). The site itself has no IPv6 address — and you can't make one up from the IPv4. Why some hosts don't offer it

Copy the evidence — a citation-ready record of this measurement

 Permanent link: aaaa.bot/r/XU6R3Q0q_b · How we measure

Checked 2026-11-05 16:00:44 UTC. Full DNS report: dns.pizza/domain/blesk.cz · Age, certificate and blocklists: how.is/blesk.cz · JSON: /api/v1/blesk.cz