Yes — keyoo.dev has IPv6.

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

IPv6 readiness

Works over IPv6, with one gap: its mail servers lack IPv6.

Website over IPv6 keyoo.dev has 2 IPv6 addresses and answers on every one we tested. ✓ 2606:4700:3033::6815:3ea7 answers · 443✓ 2606:4700:3036::ac43:898b answers · 443	yes
www over IPv6 www.keyoo.dev has 2 IPv6 addresses and answers on every one we tested. ✓ 2606:4700:3036::ac43:898b answers · 443✓ 2606:4700:3033::6815:3ea7 answers · 443	yes
Mail servers (MX) have IPv6 None of the mail servers has an AAAA record. mx1.mail.ovh.net ✗mx3.mail.ovh.net ✗mx2.mail.ovh.net ✗	no
Nameservers have IPv6 2 of 2 nameservers checked have an AAAA record, so IPv6-only resolvers can look the domain up. braden.ns.cloudflare.com ✓dayana.ns.cloudflare.com ✓	yes

HTTPS over IPv6 · not part of the grade yet
Loads over IPv6 with a valid certificate: HTTP 403.

https://keyoo.dev/ via 2606:4700:3033::6815:3ea7 → 403

works

What's keeping keyoo.dev from an A

Mail servers without IPv6
mx1.mail.ovh.net, mx3.mail.ovh.net, mx2.mail.ovh.net have no AAAA record, so mail from IPv6-only servers can't reach them directly. If a provider runs your mail, that's their setting; if you run it, add AAAA records for these hosts.

Check again

keyoo.dev Has IPv6

A (IPv4)	104.21.62.167 172.67.137.139
AAAA (IPv6)	2606:4700:3033::6815:3ea7 2606:4700:3036::ac43:898b

www.keyoo.dev Has IPv6

A (IPv4)	104.21.62.167 172.67.137.139
AAAA (IPv6)	2606:4700:3036::ac43:898b 2606:4700:3033::6815:3ea7

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

IPv6 measurement: keyoo.dev
Measured 2026-11-11 02:57:55 UTC by aaaa.bot (one server on Fly.io, region iad)

A (IPv4):    104.21.62.167, 172.67.137.139
AAAA (IPv6): 2606:4700:3033::6815:3ea7, 2606:4700:3036::ac43:898b
www AAAA:    2606:4700:3036::ac43:898b, 2606:4700:3033::6815:3ea7

Readiness grade B: Works over IPv6, with one gap: its mail servers lack IPv6.
- Website over IPv6: keyoo.dev has 2 IPv6 addresses and answers on every one we tested.
    2606:4700:3033::6815:3ea7: answers (TCP 443)
    2606:4700:3036::ac43:898b: answers (TCP 443)
- www over IPv6: www.keyoo.dev has 2 IPv6 addresses and answers on every one we tested.
    2606:4700:3036::ac43:898b: answers (TCP 443)
    2606:4700:3033::6815:3ea7: answers (TCP 443)
- Mail servers (MX) have IPv6: None of the mail servers has an AAAA record.
- Nameservers have IPv6: 2 of 2 nameservers checked have an AAAA record, so IPv6-only resolvers can look the domain up.

Reachability = a TCP connection opened on port 443 (or 80).

HTTPS over IPv6 (not graded): Loads over IPv6 with a valid certificate: HTTP 403.
    https://keyoo.dev/ via 2606:4700:3033::6815:3ea7 -> HTTP 403, certificate: valid
DNS answers via DNS-over-HTTPS (Cloudflare). Method: https://aaaa.bot/method
Permanent link: https://aaaa.bot/r/XVsCM8h3d9

Permanent link: aaaa.bot/r/XVsCM8h3d9 · How we measure

Checked 2026-11-11 02:57:55 UTC. Full DNS report: dns.pizza/domain/keyoo.dev · Age, certificate and blocklists: how.is/keyoo.dev · JSON: /api/v1/keyoo.dev