Yes — only-winners.cfd has IPv6.

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

IPv6 readiness

Website, mail and DNS all work over IPv6.

Website over IPv6 only-winners.cfd has 2 IPv6 addresses and answers on every one we tested. ✓ 2606:4700:3034::ac43:d14d answers · 443✓ 2606:4700:3033::6815:4afd answers · 443	yes
www over IPv6 www.only-winners.cfd has 2 IPv6 addresses and answers on every one we tested. ✓ 2606:4700:3033::6815:4afd answers · 443✓ 2606:4700:3034::ac43:d14d answers · 443	yes
Mail servers (MX) have IPv6 No MX records, so mail goes to the domain's own address (implicit MX). It has an AAAA record.	yes
Nameservers have IPv6 2 of 2 nameservers checked have an AAAA record, so IPv6-only resolvers can look the domain up. harlan.ns.cloudflare.com ✓maria.ns.cloudflare.com ✓	yes

HTTPS over IPv6 · not part of the grade yet
Answered over IPv6 with a server error (HTTP 523) — can't tell whether that's specific to IPv6.

https://only-winners.cfd/ via 2606:4700:3034::ac43:d14d → 523

Nothing keeping you from an A

Nothing to fix
Show it off: add the badge to your README.
[![IPv6](https://aaaa.bot/badge/only-winners.cfd.svg)](https://aaaa.bot/only-winners.cfd)

Check again

only-winners.cfd Has IPv6

A (IPv4)	172.67.209.77 104.21.74.253
AAAA (IPv6)	2606:4700:3034::ac43:d14d 2606:4700:3033::6815:4afd

www.only-winners.cfd Has IPv6

A (IPv4)	172.67.209.77 104.21.74.253
AAAA (IPv6)	2606:4700:3033::6815:4afd 2606:4700:3034::ac43:d14d

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: only-winners.cfd
Measured 2026-11-15 03:11:54 UTC by aaaa.bot (one server on Fly.io, region iad)

A (IPv4):    172.67.209.77, 104.21.74.253
AAAA (IPv6): 2606:4700:3034::ac43:d14d, 2606:4700:3033::6815:4afd
www AAAA:    2606:4700:3033::6815:4afd, 2606:4700:3034::ac43:d14d

Readiness grade A: Website, mail and DNS all work over IPv6.
- Website over IPv6: only-winners.cfd has 2 IPv6 addresses and answers on every one we tested.
    2606:4700:3034::ac43:d14d: answers (TCP 443)
    2606:4700:3033::6815:4afd: answers (TCP 443)
- www over IPv6: www.only-winners.cfd has 2 IPv6 addresses and answers on every one we tested.
    2606:4700:3033::6815:4afd: answers (TCP 443)
    2606:4700:3034::ac43:d14d: answers (TCP 443)
- Mail servers (MX) have IPv6: No MX records, so mail goes to the domain's own address (implicit MX). It 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): Answered over IPv6 with a server error (HTTP 523) — can't tell whether that's specific to IPv6.
    https://only-winners.cfd/ via 2606:4700:3034::ac43:d14d -> HTTP 523, certificate: valid
DNS answers via DNS-over-HTTPS (Cloudflare). Method: https://aaaa.bot/method
Permanent link: https://aaaa.bot/r/Fw3WQz_drZ

Permanent link: aaaa.bot/r/Fw3WQz_drZ · How we measure

Checked 2026-11-15 03:11:54 UTC. Full DNS report: dns.pizza/domain/only-winners.cfd · Age, certificate and blocklists: how.is/only-winners.cfd · JSON: /api/v1/only-winners.cfd