Yes — telefonica.de has IPv6.

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

IPv6 readiness

Works over IPv6, with gaps: its mail servers lack IPv6; its nameservers lack IPv6.

Website over IPv6 telefonica.de has an AAAA record and answers on it. ✓ 2001:780:138:547::d55f:b50c answers · 443	yes
www over IPv6 www.telefonica.de has an AAAA record and answers on it. ✓ 2001:780:138:547::d55f:b50c answers · 443	yes
Mail servers (MX) have IPv6 None of the mail servers has an AAAA record. mailserver1.viaginterkom.de ✗	no
Nameservers have IPv6 No nameserver has an AAAA record — an IPv6-only resolver can't reach this domain's DNS. ns2.telefonica.de ✗ns3.telefonica.de ✗ns1.telefonica.de ✗	no

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

https://telefonica.de/ via 2001:780:138:547::d55f:b50c → 301https://www.telefonica.de/ via 2001:780:138:547::d55f:b50c → 200

works

What's keeping telefonica.de from an A

Mail servers without IPv6
mailserver1.viaginterkom.de has no AAAA record, so mail from IPv6-only servers can't reach it directly. If a provider runs your mail, that's their setting; if you run it, add AAAA records for these hosts.
Nameservers without IPv6
ns2.telefonica.de, ns3.telefonica.de, ns1.telefonica.de all have no AAAA record, so a resolver that only speaks IPv6 can't look your domain up. Most DNS providers offer IPv6 nameservers; ask yours, or move DNS to one that does.

Check again

telefonica.de Has IPv6

A (IPv4)	213.95.181.12
AAAA (IPv6)	2001:780:138:547::d55f:b50c

www.telefonica.de Has IPv6

A (IPv4)	213.95.181.12
AAAA (IPv6)	2001:780:138:547::d55f:b50c

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: telefonica.de
Measured 2026-10-31 02:04:31 UTC by aaaa.bot (one server on Fly.io, region iad)

A (IPv4):    213.95.181.12
AAAA (IPv6): 2001:780:138:547::d55f:b50c
www AAAA:    2001:780:138:547::d55f:b50c

Readiness grade C: Works over IPv6, with gaps: its mail servers lack IPv6; its nameservers lack IPv6.
- Website over IPv6: telefonica.de has an AAAA record and answers on it.
    2001:780:138:547::d55f:b50c: answers (TCP 443)
- www over IPv6: www.telefonica.de has an AAAA record and answers on it.
    2001:780:138:547::d55f:b50c: answers (TCP 443)
- Mail servers (MX) have IPv6: None of the mail servers has an AAAA record.
- Nameservers have IPv6: No nameserver has an AAAA record — an IPv6-only resolver can't reach this domain's DNS.

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://telefonica.de/ via 2001:780:138:547::d55f:b50c -> HTTP 301, certificate: valid
    https://www.telefonica.de/ via 2001:780:138:547::d55f:b50c -> HTTP 200, certificate: valid
DNS answers via DNS-over-HTTPS (Cloudflare). Method: https://aaaa.bot/method
Permanent link: https://aaaa.bot/r/It4Yaam98H

Permanent link: aaaa.bot/r/It4Yaam98H · How we measure

Checked 2026-10-31 02:04:31 UTC — one of the top 1,000 sites, re-checked weekly. Re-check now. Full DNS report: dns.pizza/domain/telefonica.de · JSON: /api/v1/telefonica.de