Yes — supportbox.cz has IPv6.

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

This is a saved measurement from 2026-11-04 23:50 UTC. Check supportbox.cz live now

B
IPv6 readiness
Works over IPv6, with one gap: www doesn't fully work over IPv6.
Website over IPv6
supportbox.cz has 2 IPv6 addresses and answers on every one we tested.
✓ 2606:4700:3032::ac43:918b answers · 443✓ 2606:4700:3031::6815:51b3 answers · 443
yes
www over IPv6
www.supportbox.cz has no AAAA record.		no
Mail servers (MX) have IPv6
Every mail server has an AAAA record.
aspmx.l.google.com ✓alt3.aspmx.l.google.com ✓alt4.aspmx.l.google.com ✓alt1.aspmx.l.google.com ✓alt2.aspmx.l.google.com ✓
yes
Nameservers have IPv6
2 of 2 nameservers checked have an AAAA record, so IPv6-only resolvers can look the domain up.
darwin.ns.cloudflare.com ✓marge.ns.cloudflare.com ✓
yes
HTTPS over IPv6 · not part of the grade yet
Loads over IPv6 with a valid certificate: HTTP 200.
https://supportbox.cz/ via 2606:4700:3032::ac43:918b → 200
works

What's keeping supportbox.cz from an A

  1. Add IPv6 for www.supportbox.cz
    www.supportbox.cz has no AAAA record. Get www's IPv6 address from whoever hosts www and add it as an AAAA record. If the same server already serves both names (and its certificate covers www), you can reuse supportbox.cz's AAAA record(s) for www. How to add an AAAA record

Check again

supportbox.cz  Has IPv6

A (IPv4)104.21.81.179
172.67.145.139
AAAA (IPv6)2606:4700:3032::ac43:918b
2606:4700:3031::6815:51b3

www.supportbox.cz  IPv4 only

A (IPv4)62.109.150.175
AAAA (IPv6)none

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/tsZlUh53JC · How we measure

Checked 2026-11-04 23:50:35 UTC. Full DNS report: dns.pizza/domain/supportbox.cz · Age, certificate and blocklists: how.is/supportbox.cz · JSON: /api/v1/supportbox.cz