IPv6
Measured 2026-11-02 17:38 UTC · aaaa.botWebsite, mail and DNS all work over IPv6.
All 4 published IPv6 addresses accepted a connection when we tried them.
- ✓ colorado.edu answers (4 of 4 addresses)
- ✓ www.colorado.edu answers (4 of 4)
- ✓ Mail: 1 of 1 servers have IPv6
- ✓ Nameservers: 6 of 6 have IPv6
Details: published addresses and what answered
Loads over IPv6 with a valid certificate after 1 redirect: HTTP 200.
| Name | Published address (AAAA) | Answers when we connect |
|---|---|---|
| colorado.edu | Published2a04:4e42::6452a04:4e42:600::6452a04:4e42:400::6452a04:4e42:200::645 | Answers when we connect✓ answers on 443✓ answers on 443✓ answers on 443✓ answers on 443 |
| www.colorado.edu | Published2a04:4e42::6452a04:4e42:200::6452a04:4e42:400::6452a04:4e42:600::645 | Answers when we connect✓ answers on 443✓ answers on 443✓ answers on 443✓ answers on 443 |
Publishedcolorado-edu.mail.protection.outlook.com | Answers when we connect✓ has IPv6 | |
| Nameservers | Publisheda1-153.akam.neta3-66.akam.neta22-67.akam.neta20-65.akam.neta11-66.akam.neta2-67.akam.net | Answers when we connect✓ has IPv6✓ has IPv6✓ has IPv6✓ has IPv6✓ has IPv6✓ has IPv6 |
Lineage
Our records: Jan 7, 2009 → Nov 2, 2026Oldest registry snapshot we hold: 2025 · 0 renewals on record. These dates are when our records begin, not when the domain was registered.
DNS provider
- colorado.eduJan 2009 – Mar 2023
- AkamaiMay 2023 – Jun 2026
IPv6
- IPv6published, and answeringFirst measured Nov 2026
What changed
- IPv6 first measured: published, and answering on Nov 2, 2026colorado.edu has 4 IPv6 addresses. Grade A. Measured by aaaa.bot, 2026-11-02 00:04 UTC. No earlier IPv6 record is held, so this is not a "gained" date.
- DNS moved to Akamai between Mar 20, 2023 and May 1, 2023boulder.colorado.edu, oldduke.colorado.edu, otis.colorado.edu → a1-153.akam.net, a11-66.akam.net, a2-67.akam.net, a20-65.akam.net, a22-67.akam.net, a3-66.akam.net. Old set last seen in WHOIS on 2023-03-20; new set first seen in WHOIS on 2023-05-01.
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: 22 WHOIS/RDAP snapshots, 2025-01-06 to 2025-04-29 (ledger built 2026-09-27). Every renewal
DNS provider, WHOIS snapshots: 406 WHOIS/RDAP snapshots that listed nameservers, 2009-01-07 to 2026-06-12 (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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