Yes — firmy.cz has IPv6.

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

This is a saved measurement from 2026-11-15 15:50 UTC. Check firmy.cz live now

A
IPv6 readiness
Website, mail and DNS all work over IPv6.
Website over IPv6
firmy.cz has an AAAA record and answers on it.
✓ 2a02:598:2::191 answers · 443
yes
www over IPv6
www.firmy.cz has an AAAA record and answers on it.
✓ 2a02:598:2::191 answers · 443
yes
Mail servers (MX) have IPv6
Every mail server has an AAAA record.
bb4bdcba74d9f0f3.mx1.emailprofi.seznam.cz ✓bb4bdcba74d9f0f3.mx2.emailprofi.seznam.cz ✓
yes
Nameservers have IPv6
2 of 2 nameservers checked have an AAAA record, so IPv6-only resolvers can look the domain up.
ams.seznam.cz ✓ans.seznam.cz ✓
yes
HTTPS over IPv6 · not part of the grade yet
Loads over IPv6 with a valid certificate after 1 redirect: HTTP 200.
https://firmy.cz/ via 2a02:598:2::191 → 301https://www.firmy.cz/ via 2a02:598:2::191 → 200
works

Nothing keeping you from an A

  1. Nothing to fix
    Show it off: add the badge to your README.
    [![IPv6](https://aaaa.bot/badge/firmy.cz.svg)](https://aaaa.bot/firmy.cz)

Check again

firmy.cz  Has IPv6

A (IPv4)77.75.76.191
AAAA (IPv6)2a02:598:2::191

www.firmy.cz  Has IPv6

Alias offirmy.cz
A (IPv4)77.75.76.191
AAAA (IPv6)2a02:598:2::191

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/rBKOPHMwAe · How we measure

Checked 2026-11-15 15:50:15 UTC. Full DNS report: dns.pizza/domain/firmy.cz · Age, certificate and blocklists: how.is/firmy.cz · JSON: /api/v1/firmy.cz