IPv6
Measured 2026-11-12 04:52 UTC · aaaa.botWebsite, mail and DNS all work over IPv6.
The published IPv6 address accepted a connection when we tried it.
- ✓ cssz.cz answers (1 of 1 addresses)
- ✓ www.cssz.cz answers (1 of 1)
- ✓ Mail: 2 of 2 servers have IPv6
- ✓ Nameservers: 2 of 5 have IPv6
Details: published addresses and what answered
Loads over IPv6 with a valid certificate after 2 redirects: HTTP 200.
| Name | Published address (AAAA) | Answers when we connect |
|---|---|---|
| cssz.cz | Published2001:af0:fff6:ee02::28 | Answers when we connect✓ answers on 443 |
| www.cssz.cz | Published2603:1061:14:4c::1 | Answers when we connect✓ answers on 443 |
Publishedmail01-2x.cssz.czmail01-xx.cssz.cz | Answers when we connect✓ has IPv6✓ has IPv6 | |
| Nameservers | Publisheddns.cssz.czdns2.cssz.czdns3.cssz.czdns4.cssz.czsdns.zarea.net | Answers when we connect✓ has IPv6✓ has IPv6✗ no IPv6✗ no IPv6✗ no IPv6 |
See where it lives on the IPv4 map →
Lineage
Our records: Feb 16, 2025 → Nov 12, 2026Oldest registry snapshot we hold: 2025 · 1 renewal on record. These dates are when our records begin, not when the domain was registered.
IPv6
- IPv6published, and answeringFirst measured Nov 2026
What changed
- IPv6 first measured: published, and answering on Nov 12, 2026cssz.cz has 1 IPv6 address. Grade A. Measured by aaaa.bot, 2026-11-12 04:52 UTC. No earlier IPv6 record is held, so this is not a "gained" date.
- Renewed +1 year between Jul 19, 2025 and Oct 13, 2025Expiry moved from 2025-10-09 to 2026-10-09.
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: 10 WHOIS/RDAP snapshots, 2025-02-16 to 2026-01-17 (ledger built 2026-09-27). Every renewal
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