Yes — hardcurrency.org 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 hardcurrency.org has 4 IPv6 addresses and answers on every one we tested. ✓ 2001:4860:4802:38::15 answers · 443✓ 2001:4860:4802:34::15 answers · 443✓ 2001:4860:4802:32::15 answers · 443✓ 2001:4860:4802:36::15 answers · 443	yes
www over IPv6 www.hardcurrency.org has 4 IPv6 addresses and answers on every one we tested. ✓ 2001:4860:4802:36::15 answers · 443✓ 2001:4860:4802:32::15 answers · 443✓ 2001:4860:4802:34::15 answers · 443✓ 2001:4860:4802:38::15 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. ns1068.ui-dns.com ✓ns1058.ui-dns.biz ✓ns1037.ui-dns.de ✓ns1024.ui-dns.org ✓	yes

HTTPS over IPv6 · not part of the grade yet
Loads over IPv6 with a valid certificate after 1 redirect: HTTP 200.

https://hardcurrency.org/ via 2001:4860:4802:38::15 → 302https://hardcurrency.org/login via 2001:4860:4802:38::15 → 200

works

What's keeping hardcurrency.org 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

hardcurrency.org Has IPv6

A (IPv4)	216.239.38.21 216.239.36.21 216.239.32.21 216.239.34.21
AAAA (IPv6)	2001:4860:4802:38::15 2001:4860:4802:34::15 2001:4860:4802:32::15 2001:4860:4802:36::15

www.hardcurrency.org Has IPv6

A (IPv4)	216.239.38.21 216.239.32.21 216.239.36.21 216.239.34.21
AAAA (IPv6)	2001:4860:4802:36::15 2001:4860:4802:32::15 2001:4860:4802:34::15 2001:4860:4802:38::15

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: hardcurrency.org
Measured 2026-11-09 00:40:59 UTC by aaaa.bot (one server on Fly.io, region iad)

A (IPv4):    216.239.38.21, 216.239.36.21, 216.239.32.21, 216.239.34.21
AAAA (IPv6): 2001:4860:4802:38::15, 2001:4860:4802:34::15, 2001:4860:4802:32::15, 2001:4860:4802:36::15
www AAAA:    2001:4860:4802:36::15, 2001:4860:4802:32::15, 2001:4860:4802:34::15, 2001:4860:4802:38::15

Readiness grade B: Works over IPv6, with one gap: its mail servers lack IPv6.
- Website over IPv6: hardcurrency.org has 4 IPv6 addresses and answers on every one we tested.
    2001:4860:4802:38::15: answers (TCP 443)
    2001:4860:4802:34::15: answers (TCP 443)
    2001:4860:4802:32::15: answers (TCP 443)
    2001:4860:4802:36::15: answers (TCP 443)
- www over IPv6: www.hardcurrency.org has 4 IPv6 addresses and answers on every one we tested.
    2001:4860:4802:36::15: answers (TCP 443)
    2001:4860:4802:32::15: answers (TCP 443)
    2001:4860:4802:34::15: answers (TCP 443)
    2001:4860:4802:38::15: 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): Loads over IPv6 with a valid certificate after 1 redirect: HTTP 200.
    https://hardcurrency.org/ via 2001:4860:4802:38::15 -> HTTP 302, certificate: valid
    https://hardcurrency.org/login via 2001:4860:4802:38::15 -> HTTP 200, certificate: valid
DNS answers via DNS-over-HTTPS (Cloudflare). Method: https://aaaa.bot/method
Permanent link: https://aaaa.bot/r/kBVh76oPJo

Permanent link: aaaa.bot/r/kBVh76oPJo · How we measure

Checked 2026-11-09 00:40:59 UTC. Full DNS report: dns.pizza/domain/hardcurrency.org · Age, certificate and blocklists: how.is/hardcurrency.org · JSON: /api/v1/hardcurrency.org