IPv6
Measured 2026-11-04 13:03 UTC · aaaa.botWorks over IPv6, with one gap: its mail servers lack IPv6.
irozhlas.cz has 3 IPv6 addresses and answers on every one we tested.
- ✓ irozhlas.cz answers (3 of 3 addresses)
- ✓ www.irozhlas.cz answers (3 of 3)
- ✗ Mail: 0 of 2 servers have IPv6
- ✓ Nameservers: 2 of 2 have IPv6
Details: published addresses and what answered
Loads over IPv6 with a valid certificate: HTTP 403.
| Name | Published address (AAAA) | Answers when we connect |
|---|---|---|
| irozhlas.cz | Published2606:4700:20::ac43:4a9d2606:4700:20::681a:e3c2606:4700:20::681a:f3c | Answers when we connect✓ answers on 443✓ answers on 443✓ answers on 443 |
| www.irozhlas.cz | Published2606:4700:20::681a:e3c2606:4700:20::681a:f3c2606:4700:20::ac43:4a9d | Answers when we connect✓ answers on 443✓ answers on 443✓ answers on 443 |
Publishedddei1.cro.czddei2.cro.cz | Answers when we connect✗ no IPv6✗ no IPv6 | |
| Nameservers | Publisheddavina.ns.cloudflare.comsergi.ns.cloudflare.com | Answers when we connect✓ has IPv6✓ has IPv6 |
Lineage
Our records: Jun 19, 2013 → Nov 4, 2026Oldest registry snapshot we hold: 2025 · 1 renewal on record. These dates are when our records begin, not when the domain was registered.
DNS provider
- ces.net + cro.czJun 2013 – Sep 2025
- CloudflareOct 2025 – Jun 2026
IPv6
- IPv6published, and answeringFirst measured Nov 2026
What changed
- IPv6 first measured: published, and answering on Nov 4, 2026irozhlas.cz has 3 IPv6 addresses. Grade B. Measured by aaaa.bot, 2026-11-04 13:03 UTC. No earlier IPv6 record is held, so this is not a "gained" date.
- DNS moved to Cloudflare between Sep 17, 2025 and Oct 4, 2025ns1.cro.cz, ns2.cro.cz, nsa.ces.net → davina.ns.cloudflare.com, sergi.ns.cloudflare.com. Old set last seen in WHOIS on 2025-09-17; new set first seen in WHOIS on 2025-10-04.
- Renewed +1 year between Jul 11, 2025 and Sep 5, 2025Expiry moved from 2025-09-07 to 2026-09-07.
- New nameservers at ces.net + cro.cz between May 12, 2017 and Jan 11, 2019ns.cro.cz, nsa.ces.net → ns1.cro.cz, ns2.cro.cz, nsa.ces.net. Old set last seen in WHOIS on 2017-05-12; new set first seen in WHOIS on 2019-01-11.
Solid bar: the stretch we observed that name. Dot: a single sighting. Dotted line: no record between sightings of the same name. Nothing is drawn between different names.
Registrar and renewals: 13 WHOIS/RDAP snapshots, 2025-01-14 to 2026-04-23 (ledger built 2026-09-27). Every renewal
DNS provider, WHOIS snapshots: 67 WHOIS/RDAP snapshots that listed nameservers, 2013-06-19 to 2026-06-15 (who.is archive). Both sources feed one row per provider (hover a bar to see which); a change is placed between the nearest observations on either side, and where the two sources disagree, both are listed under What changed.
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Explore related
Registered in 2010 — the same year as t.me, dnsowl.com and cdn-apple.com.