Yes — ecpp.app has IPv6.

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

B
IPv6 readiness
Works over IPv6, with one gap: its mail servers lack IPv6.
Website over IPv6
ecpp.app has an AAAA record and answers on it.
✓ 2a01:4f9:c012:7055::1 answers · 443
yes
www over IPv6
www.ecpp.app has an AAAA record and answers on it.
✓ 2a01:4f9:c012:7055::1 answers · 443
yes
Mail servers (MX) have IPv6
None of the mail servers has an AAAA record.
mxa.mailgun.org ✗mxb.mailgun.org ✗
no
Nameservers have IPv6
4 of 4 nameservers checked have an AAAA record, so IPv6-only resolvers can look the domain up.
ns1.dnsimple-edge.com ✓ns2.dnsimple-edge.net ✓ns3.dnsimple-edge.io ✓ns4.dnsimple-edge.org ✓
yes
HTTPS over IPv6 · not part of the grade yet
Loads over IPv6 with a valid certificate: HTTP 200.
https://ecpp.app/ via 2a01:4f9:c012:7055::1 → 200
works
 Which outside scripts, fonts, payments or chat ecpp.app loads from have no IPv6.
 Load ecpp.app over IPv6 from up to six other places — a second opinion.

What's keeping ecpp.app from an A

  1. Mail servers without IPv6
    mxa.mailgun.org, mxb.mailgun.org 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

ecpp.app  Has IPv6

A (IPv4)2.29.155.64
AAAA (IPv6)2a01:4f9:c012:7055::1

www.ecpp.app  Has IPv6

A (IPv4)2.29.155.64
AAAA (IPv6)2a01:4f9:c012:7055::1

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

 Permanent link: aaaa.bot/r/JZxwTw4a3C · How we measure

Checked 2026-11-10 07:31:20 UTC. Full DNS report: dns.pizza/domain/ecpp.app · Age, certificate and blocklists: how.is/ecpp.app · JSON: /api/v1/ecpp.app