Yes — kmmattress.store 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
kmmattress.store has 2 IPv6 addresses and answers on every one we tested.
✓ 2606:4700:3035::6815:4deb answers · 443✓ 2606:4700:3030::ac43:d495 answers · 443
yes
www over IPv6
www.kmmattress.store has 2 IPv6 addresses and answers on every one we tested.
✓ 2606:4700:3030::ac43:d495 answers · 443✓ 2606:4700:3035::6815:4deb answers · 443
yes
Mail servers (MX) have IPv6
None of the mail servers has an AAAA record.
mx00.ionos.com ✗mx01.ionos.com ✗
no
Nameservers have IPv6
2 of 2 nameservers checked have an AAAA record, so IPv6-only resolvers can look the domain up.
celine.ns.cloudflare.com ✓maciej.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://kmmattress.store/ via 2606:4700:3035::6815:4deb → 301https://kmmattress.com/ via 2606:4700:3033::ac43:97a3 → 200
works
 Which outside scripts, fonts, payments or chat kmmattress.store loads from have no IPv6.
 Load kmmattress.store over IPv6 from up to six other places — a second opinion.

What's keeping kmmattress.store from an A

  1. Mail servers without IPv6
    mx00.ionos.com, mx01.ionos.com 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

kmmattress.store  Has IPv6

A (IPv4)104.21.77.235
172.67.212.149
AAAA (IPv6)2606:4700:3035::6815:4deb
2606:4700:3030::ac43:d495

www.kmmattress.store  Has IPv6

A (IPv4)104.21.77.235
172.67.212.149
AAAA (IPv6)2606:4700:3030::ac43:d495
2606:4700:3035::6815:4deb

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/LHYm6O_GHK · How we measure

Checked 2026-11-08 12:38:40 UTC. Full DNS report: dns.pizza/domain/kmmattress.store · Age, certificate and blocklists: how.is/kmmattress.store · JSON: /api/v1/kmmattress.store