Yes — codivalab.tech has IPv6.

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

B
IPv6 readiness
Works over IPv6, with one gap: its mail servers lack IPv6.
Website over IPv6
codivalab.tech has 2 IPv6 addresses and answers on every one we tested.
✓ 2606:4700:3036::ac43:cdd9 answers · 443✓ 2606:4700:3036::6815:34f7 answers · 443
yes
www over IPv6
www.codivalab.tech has 2 IPv6 addresses and answers on every one we tested.
✓ 2606:4700:3036::ac43:cdd9 answers · 443✓ 2606:4700:3036::6815:34f7 answers · 443
yes
Mail servers (MX) have IPv6
None of the mail servers has an AAAA record.
_dc-mx.396d05e146dd.codivalab.tech ✗
no
Nameservers have IPv6
2 of 2 nameservers checked have an AAAA record, so IPv6-only resolvers can look the domain up.
benedict.ns.cloudflare.com ✓nelly.ns.cloudflare.com ✓
yes
HTTPS over IPv6 · not part of the grade yet
Loads over IPv6 with a valid certificate after 1 redirect: HTTP 200.
https://codivalab.tech/ via 2606:4700:3036::ac43:cdd9 → 301https://www.codivalab.tech/ via 2606:4700:3036::ac43:cdd9 → 200
works
 Load codivalab.tech over IPv6 from up to six other places — a second opinion.

What's keeping codivalab.tech from an A

  1. Mail servers without IPv6
    _dc-mx.396d05e146dd.codivalab.tech has no AAAA record, so mail from IPv6-only servers can't reach it directly. If a provider runs your mail, that's their setting; if you run it, add AAAA records for these hosts.

Check again

codivalab.tech  Has IPv6

A (IPv4)172.67.205.217
104.21.52.247
AAAA (IPv6)2606:4700:3036::ac43:cdd9
2606:4700:3036::6815:34f7

www.codivalab.tech  Has IPv6

A (IPv4)104.21.52.247
172.67.205.217
AAAA (IPv6)2606:4700:3036::ac43:cdd9
2606:4700:3036::6815:34f7

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/9Wv6QD29dp · How we measure

Checked 2026-11-01 10:51:23 UTC. Full DNS report: dns.pizza/domain/codivalab.tech · JSON: /api/v1/codivalab.tech