IPv6
Measured 2026-11-04 23:50 UTC · aaaa.botWorks over IPv6, with one gap: www doesn't fully work over IPv6.
supportbox.cz has 2 IPv6 addresses and answers on every one we tested.
- ✓ supportbox.cz answers (2 of 2 addresses)
- ✗ www.supportbox.cz: no IPv6 address
- ✓ Mail: 5 of 5 servers have IPv6
- ✓ Nameservers: 2 of 2 have IPv6
Details: published addresses and what answered
Loads over IPv6 with a valid certificate: HTTP 200.
| Name | Published address (AAAA) | Answers when we connect |
|---|---|---|
| supportbox.cz | Published2606:4700:3032::ac43:918b2606:4700:3031::6815:51b3 | Answers when we connect✓ answers on 443✓ answers on 443 |
| www.supportbox.cz | Publishedno IPv6 address published | Answers when we connectnothing to test |
Publishedaspmx.l.google.comalt3.aspmx.l.google.comalt4.aspmx.l.google.comalt1.aspmx.l.google.comalt2.aspmx.l.google.com | Answers when we connect✓ has IPv6✓ has IPv6✓ has IPv6✓ has IPv6✓ has IPv6 | |
| Nameservers | Publisheddarwin.ns.cloudflare.commarge.ns.cloudflare.com | Answers when we connect✓ has IPv6✓ has IPv6 |
See where it lives on the IPv4 map →
Lineage
Our records: May 3, 2017 → Nov 4, 2026Oldest registry snapshot we hold: 2026 · 0 renewals on record. These dates are when our records begin, not when the domain was registered.
DNS provider
- web4u.czMay 2017
- CloudflareFeb 2020 – May 2026
IPv6
- IPv6published, and answeringFirst measured Nov 2026
What changed
- IPv6 first measured: published, and answering on Nov 4, 2026supportbox.cz has 2 IPv6 addresses. Grade B. Measured by aaaa.bot, 2026-11-04 23:50 UTC. No earlier IPv6 record is held, so this is not a "gained" date.
- DNS moved to Cloudflare between May 3, 2017 and Feb 7, 2020ns.web4u.cz, ns2.web4u.cz → darwin.ns.cloudflare.com, marge.ns.cloudflare.com. Old set last seen in WHOIS on 2017-05-03; new set first seen in WHOIS on 2020-02-07.
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: 2 WHOIS/RDAP snapshots, 2026-01-15 to 2026-05-17 (ledger built 2026-09-27). Every renewal
DNS provider, WHOIS snapshots: 19 WHOIS/RDAP snapshots that listed nameservers, 2017-05-03 to 2026-05-17 (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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Registered in 2012 — the same year as sentry.io, snapchat.com and aliyuncs.com.