Yes — csstats.xyz 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 csstats.xyz has 2 IPv6 addresses and answers on every one we tested. ✓ 2606:4700:3033::6815:2414 answers · 443✓ 2606:4700:3033::ac43:b7d5 answers · 443	yes
www over IPv6 www.csstats.xyz has 2 IPv6 addresses and answers on every one we tested. ✓ 2606:4700:3033::6815:2414 answers · 443✓ 2606:4700:3033::ac43:b7d5 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. nola.ns.cloudflare.com ✓nolan.ns.cloudflare.com ✓	yes

HTTPS over IPv6 · not part of the grade yet
Loads over IPv6 with a valid certificate: HTTP 200.

https://csstats.xyz/ via 2606:4700:3033::6815:2414 → 200

works

What's keeping csstats.xyz 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

csstats.xyz Has IPv6

A (IPv4)	104.21.36.20 172.67.183.213
AAAA (IPv6)	2606:4700:3033::6815:2414 2606:4700:3033::ac43:b7d5

www.csstats.xyz Has IPv6

A (IPv4)	172.67.183.213 104.21.36.20
AAAA (IPv6)	2606:4700:3033::6815:2414 2606:4700:3033::ac43:b7d5

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: csstats.xyz
Measured 2026-11-13 10:30:42 UTC by aaaa.bot (one server on Fly.io, region iad)

A (IPv4):    104.21.36.20, 172.67.183.213
AAAA (IPv6): 2606:4700:3033::6815:2414, 2606:4700:3033::ac43:b7d5
www AAAA:    2606:4700:3033::6815:2414, 2606:4700:3033::ac43:b7d5

Readiness grade B: Works over IPv6, with one gap: its mail servers lack IPv6.
- Website over IPv6: csstats.xyz has 2 IPv6 addresses and answers on every one we tested.
    2606:4700:3033::6815:2414: answers (TCP 443)
    2606:4700:3033::ac43:b7d5: answers (TCP 443)
- www over IPv6: www.csstats.xyz has 2 IPv6 addresses and answers on every one we tested.
    2606:4700:3033::6815:2414: answers (TCP 443)
    2606:4700:3033::ac43:b7d5: 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 200.
    https://csstats.xyz/ via 2606:4700:3033::6815:2414 -> HTTP 200, certificate: valid
DNS answers via DNS-over-HTTPS (Cloudflare). Method: https://aaaa.bot/method
Permanent link: https://aaaa.bot/r/rqoZbqeFE1

Permanent link: aaaa.bot/r/rqoZbqeFE1 · How we measure

Checked 2026-11-13 10:30:42 UTC. Full DNS report: dns.pizza/domain/csstats.xyz · Age, certificate and blocklists: how.is/csstats.xyz · JSON: /api/v1/csstats.xyz