Yes — kleinanzeigen.de has IPv6.

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

IPv6 readiness

Website, mail and DNS all work over IPv6.

Website over IPv6 kleinanzeigen.de has 2 IPv6 addresses and answers on every one we tested. ✓ 2600:1408:ec00:2f::1735:b89 answers · 443✓ 2600:1408:ec00:2f::1735:b86 answers · 443	yes
www over IPv6 www.kleinanzeigen.de has 2 IPv6 addresses and answers on every one we tested. ✓ 2600:1408:c400:16::17d4:f80b answers · 443✓ 2600:1408:c400:16::17d4:f80e answers · 443	yes
Mail servers (MX) have IPv6 Every mail server has an AAAA record. alt1.aspmx.l.google.com ✓alt4.aspmx.l.google.com ✓alt3.aspmx.l.google.com ✓alt2.aspmx.l.google.com ✓aspmx.l.google.com ✓	yes
Nameservers have IPv6 4 of 4 nameservers checked have an AAAA record, so IPv6-only resolvers can look the domain up. ns-cloud-e3.googledomains.com ✓ns-cloud-e4.googledomains.com ✓ns-cloud-e2.googledomains.com ✓ns-cloud-e1.googledomains.com ✓	yes

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

https://kleinanzeigen.de/ via 2600:1408:ec00:2f::1735:b89 → 301https://www.kleinanzeigen.de/ via 2600:1408:c400:16::17d4:f80b → 200

works

Nothing keeping you from an A

Nothing to fix
Show it off: add the badge to your README.
[![IPv6](https://aaaa.bot/badge/kleinanzeigen.de.svg)](https://aaaa.bot/kleinanzeigen.de)

Check again

kleinanzeigen.de Has IPv6

A (IPv4)	23.48.203.143 23.48.203.147
AAAA (IPv6)	2600:1408:ec00:2f::1735:b89 2600:1408:ec00:2f::1735:b86

www.kleinanzeigen.de Has IPv6

Alias of	www.kleinanzeigen.de.edgekey.net → e77447.dsca.akamaiedge.net
A (IPv4)	23.212.249.81 23.212.249.84 23.212.249.69 23.212.249.87 23.212.249.78
AAAA (IPv6)	2600:1408:c400:16::17d4:f80b 2600:1408:c400:16::17d4:f80e

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: kleinanzeigen.de
Measured 2026-10-31 20:30:34 UTC by aaaa.bot (one server on Fly.io, region iad)

A (IPv4):    23.48.203.143, 23.48.203.147
AAAA (IPv6): 2600:1408:ec00:2f::1735:b89, 2600:1408:ec00:2f::1735:b86
www AAAA:    2600:1408:c400:16::17d4:f80b, 2600:1408:c400:16::17d4:f80e

Readiness grade A: Website, mail and DNS all work over IPv6.
- Website over IPv6: kleinanzeigen.de has 2 IPv6 addresses and answers on every one we tested.
    2600:1408:ec00:2f::1735:b89: answers (TCP 443)
    2600:1408:ec00:2f::1735:b86: answers (TCP 443)
- www over IPv6: www.kleinanzeigen.de has 2 IPv6 addresses and answers on every one we tested.
    2600:1408:c400:16::17d4:f80b: answers (TCP 443)
    2600:1408:c400:16::17d4:f80e: answers (TCP 443)
- Mail servers (MX) have IPv6: Every mail server 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://kleinanzeigen.de/ via 2600:1408:ec00:2f::1735:b89 -> HTTP 301, certificate: valid
    https://www.kleinanzeigen.de/ via 2600:1408:c400:16::17d4:f80b -> HTTP 200, certificate: valid
DNS answers via DNS-over-HTTPS (Cloudflare). Method: https://aaaa.bot/method
Permanent link: https://aaaa.bot/r/jibQxmljJ6

Permanent link: aaaa.bot/r/jibQxmljJ6 · How we measure

Checked 2026-10-31 20:30:34 UTC. Full DNS report: dns.pizza/domain/kleinanzeigen.de · JSON: /api/v1/kleinanzeigen.de