Yes — muttsandmeows.store 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 muttsandmeows.store has 2 IPv6 addresses and answers on every one we tested. ✓ 2606:4700:7::297 answers · 443✓ 2a06:98c1:58::297 answers · 443	yes
www over IPv6 www.muttsandmeows.store has 2 IPv6 addresses and answers on every one we tested. ✓ 2606:4700:7::297 answers · 443✓ 2a06:98c1:58::297 answers · 443	yes
Mail servers (MX) have IPv6 None of the mail servers has an AAAA record. mx01.ionos.com ✗mx00.ionos.com ✗	no
Nameservers have IPv6 4 of 4 nameservers checked have an AAAA record, so IPv6-only resolvers can look the domain up. ns1121.ui-dns.de ✓ns1054.ui-dns.org ✓ns1083.ui-dns.biz ✓ns1045.ui-dns.com ✓	yes

HTTPS over IPv6 · not part of the grade yet
muttsandmeows.store didn't complete an HTTPS request over IPv6 (ERR_SSL_SSL/TLS_ALERT_HANDSHAKE_FAILURE).

https://muttsandmeows.store/ via 2606:4700:7::297 · ERR_SSL_SSL/TLS_ALERT_HANDSHAKE_FAILURE

What's keeping muttsandmeows.store from an A

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

muttsandmeows.store Has IPv6

A (IPv4)	162.159.142.163 172.66.2.159
AAAA (IPv6)	2606:4700:7::297 2a06:98c1:58::297

www.muttsandmeows.store Has IPv6

Alias of	muttsandmeows.com
A (IPv4)	172.66.2.159 162.159.142.163
AAAA (IPv6)	2606:4700:7::297 2a06:98c1:58::297

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: muttsandmeows.store
Measured 2026-11-14 15:28:11 UTC by aaaa.bot (one server on Fly.io, region iad)

A (IPv4):    162.159.142.163, 172.66.2.159
AAAA (IPv6): 2606:4700:7::297, 2a06:98c1:58::297
www AAAA:    2606:4700:7::297, 2a06:98c1:58::297

Readiness grade B: Works over IPv6, with one gap: its mail servers lack IPv6.
- Website over IPv6: muttsandmeows.store has 2 IPv6 addresses and answers on every one we tested.
    2606:4700:7::297: answers (TCP 443)
    2a06:98c1:58::297: answers (TCP 443)
- www over IPv6: www.muttsandmeows.store has 2 IPv6 addresses and answers on every one we tested.
    2606:4700:7::297: answers (TCP 443)
    2a06:98c1:58::297: answers (TCP 443)
- Mail servers (MX) have IPv6: None of the mail servers has an AAAA record.
- Nameservers have IPv6: 4 of 4 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): muttsandmeows.store didn't complete an HTTPS request over IPv6 (ERR_SSL_SSL/TLS_ALERT_HANDSHAKE_FAILURE).
    https://muttsandmeows.store/ via 2606:4700:7::297 (ERR_SSL_SSL/TLS_ALERT_HANDSHAKE_FAILURE)
DNS answers via DNS-over-HTTPS (Cloudflare). Method: https://aaaa.bot/method
Permanent link: https://aaaa.bot/r/4xeSoQw8kG

Permanent link: aaaa.bot/r/4xeSoQw8kG · How we measure

Checked 2026-11-14 15:28:11 UTC. Full DNS report: dns.pizza/domain/muttsandmeows.store · Age, certificate and blocklists: how.is/muttsandmeows.store · JSON: /api/v1/muttsandmeows.store