Yes — horizonteavanza.info 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 horizonteavanza.info has an AAAA record and answers on it. ✓ 2001:8d8:100f:f000::200 answers · 443	yes
www over IPv6 www.horizonteavanza.info has an AAAA record and answers on it. ✓ 2001:8d8:100f:f000::200 answers · 443	yes
Mail servers (MX) have IPv6 None of the mail servers has an AAAA record. mx00.ionos.es ✗mx01.ionos.es ✗	no
Nameservers have IPv6 4 of 4 nameservers checked have an AAAA record, so IPv6-only resolvers can look the domain up. ns1123.ui-dns.com ✓ns1076.ui-dns.de ✓ns1045.ui-dns.biz ✓ns1118.ui-dns.org ✓	yes

HTTPS over IPv6 · not part of the grade yet
horizonteavanza.info didn't complete an HTTPS request over IPv6 (ERR_SSL_TLSV1_ALERT_INTERNAL_ERROR).

https://horizonteavanza.info/ via 2001:8d8:100f:f000::200 · ERR_SSL_TLSV1_ALERT_INTERNAL_ERROR

What's keeping horizonteavanza.info from an A

Mail servers without IPv6
mx00.ionos.es, mx01.ionos.es 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

horizonteavanza.info Has IPv6

A (IPv4)	217.160.0.163
AAAA (IPv6)	2001:8d8:100f:f000::200

www.horizonteavanza.info Has IPv6

A (IPv4)	217.160.0.163
AAAA (IPv6)	2001:8d8:100f:f000::200

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: horizonteavanza.info
Measured 2026-11-05 22:29:13 UTC by aaaa.bot (one server on Fly.io, region iad)

A (IPv4):    217.160.0.163
AAAA (IPv6): 2001:8d8:100f:f000::200
www AAAA:    2001:8d8:100f:f000::200

Readiness grade B: Works over IPv6, with one gap: its mail servers lack IPv6.
- Website over IPv6: horizonteavanza.info has an AAAA record and answers on it.
    2001:8d8:100f:f000::200: answers (TCP 443)
- www over IPv6: www.horizonteavanza.info has an AAAA record and answers on it.
    2001:8d8:100f:f000::200: 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): horizonteavanza.info didn't complete an HTTPS request over IPv6 (ERR_SSL_TLSV1_ALERT_INTERNAL_ERROR).
    https://horizonteavanza.info/ via 2001:8d8:100f:f000::200 (ERR_SSL_TLSV1_ALERT_INTERNAL_ERROR)
DNS answers via DNS-over-HTTPS (Cloudflare). Method: https://aaaa.bot/method
Permanent link: https://aaaa.bot/r/2zMLrAs6kp

Permanent link: aaaa.bot/r/2zMLrAs6kp · How we measure

Checked 2026-11-05 22:29:13 UTC. Full DNS report: dns.pizza/domain/horizonteavanza.info · Age, certificate and blocklists: how.is/horizonteavanza.info · JSON: /api/v1/horizonteavanza.info