Yes — external-dns-onehoptesting-2.one 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 external-dns-onehoptesting-2.one has an AAAA record and answers on it. ✓ 2a02:2350:5:106:803b:8988:e805:f7 answers · 443	yes
www over IPv6 www.external-dns-onehoptesting-2.one has an AAAA record and answers on it. ✓ 2a02:2350:5:106:803b:8988:e805:f7 answers · 443	yes
Mail servers (MX) have IPv6 None of the mail servers has an AAAA record. mx1.mailpod15-cph3.g1i.one.com ✗mx2.mailpod15-cph3.g1i.one.com ✗mx3.mailpod15-cph3.g1i.one.com ✗mx4.mailpod15-cph3.g1i.one.com ✗	no
Nameservers have IPv6 2 of 2 nameservers checked have an AAAA record, so IPv6-only resolvers can look the domain up. evelyn.ns.cloudflare.com ✓jacob.ns.cloudflare.com ✓	yes

HTTPS over IPv6 · not part of the grade yet
external-dns-onehoptesting-2.one didn't complete an HTTPS request over IPv6 (ERR_SSL_SSL/TLS_ALERT_HANDSHAKE_FAILURE).

https://external-dns-onehoptesting-2.one/ via 2a02:2350:5:106:803b:8988:e805:f7 · ERR_SSL_SSL/TLS_ALERT_HANDSHAKE_FAILURE

What's keeping external-dns-onehoptesting-2.one from an A

Mail servers without IPv6
mx1.mailpod15-cph3.g1i.one.com, mx2.mailpod15-cph3.g1i.one.com, mx3.mailpod15-cph3.g1i.one.com, mx4.mailpod15-cph3.g1i.one.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

external-dns-onehoptesting-2.one Has IPv6

A (IPv4)	46.30.215.167
AAAA (IPv6)	2a02:2350:5:106:803b:8988:e805:f7

www.external-dns-onehoptesting-2.one Has IPv6

A (IPv4)	46.30.215.167
AAAA (IPv6)	2a02:2350:5:106:803b:8988:e805:f7

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: external-dns-onehoptesting-2.one
Measured 2026-11-15 11:29:13 UTC by aaaa.bot (one server on Fly.io, region iad)

A (IPv4):    46.30.215.167
AAAA (IPv6): 2a02:2350:5:106:803b:8988:e805:f7
www AAAA:    2a02:2350:5:106:803b:8988:e805:f7

Readiness grade B: Works over IPv6, with one gap: its mail servers lack IPv6.
- Website over IPv6: external-dns-onehoptesting-2.one has an AAAA record and answers on it.
    2a02:2350:5:106:803b:8988:e805:f7: answers (TCP 443)
- www over IPv6: www.external-dns-onehoptesting-2.one has an AAAA record and answers on it.
    2a02:2350:5:106:803b:8988:e805:f7: 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): external-dns-onehoptesting-2.one didn't complete an HTTPS request over IPv6 (ERR_SSL_SSL/TLS_ALERT_HANDSHAKE_FAILURE).
    https://external-dns-onehoptesting-2.one/ via 2a02:2350:5:106:803b:8988:e805:f7 (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/yIA3LTQoIy

Permanent link: aaaa.bot/r/yIA3LTQoIy · How we measure

Checked 2026-11-15 11:29:13 UTC. Full DNS report: dns.pizza/domain/external-dns-onehoptesting-2.one · Age, certificate and blocklists: how.is/external-dns-onehoptesting-2.one · JSON: /api/v1/external-dns-onehoptesting-2.one