Yes — pro-cars.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 pro-cars.info has 2 IPv6 addresses and answers on every one we tested. ✓ 2606:4700:3033::ac43:a4fa answers · 443✓ 2606:4700:3033::6815:31a6 answers · 443	yes
www over IPv6 www.pro-cars.info has 2 IPv6 addresses and answers on every one we tested. ✓ 2606:4700:3033::ac43:a4fa answers · 443✓ 2606:4700:3033::6815:31a6 answers · 443	yes
Mail servers (MX) have IPv6 None of the mail servers has an AAAA record. mx00.ionos.de ✗mx01.ionos.de ✗	no
Nameservers have IPv6 2 of 2 nameservers checked have an AAAA record, so IPv6-only resolvers can look the domain up. bella.ns.cloudflare.com ✓vasilii.ns.cloudflare.com ✓	yes

HTTPS over IPv6 · not part of the grade yet
Answered over IPv6 with a server error (HTTP 530) — can't tell whether that's specific to IPv6.

https://pro-cars.info/ via 2606:4700:3033::ac43:a4fa → 530

What's keeping pro-cars.info from an A

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

pro-cars.info Has IPv6

A (IPv4)	104.21.49.166 172.67.164.250
AAAA (IPv6)	2606:4700:3033::ac43:a4fa 2606:4700:3033::6815:31a6

www.pro-cars.info Has IPv6

A (IPv4)	172.67.164.250 104.21.49.166
AAAA (IPv6)	2606:4700:3033::ac43:a4fa 2606:4700:3033::6815:31a6

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: pro-cars.info
Measured 2026-11-06 20:24:27 UTC by aaaa.bot (one server on Fly.io, region iad)

A (IPv4):    104.21.49.166, 172.67.164.250
AAAA (IPv6): 2606:4700:3033::ac43:a4fa, 2606:4700:3033::6815:31a6
www AAAA:    2606:4700:3033::ac43:a4fa, 2606:4700:3033::6815:31a6

Readiness grade B: Works over IPv6, with one gap: its mail servers lack IPv6.
- Website over IPv6: pro-cars.info has 2 IPv6 addresses and answers on every one we tested.
    2606:4700:3033::ac43:a4fa: answers (TCP 443)
    2606:4700:3033::6815:31a6: answers (TCP 443)
- www over IPv6: www.pro-cars.info has 2 IPv6 addresses and answers on every one we tested.
    2606:4700:3033::ac43:a4fa: answers (TCP 443)
    2606:4700:3033::6815:31a6: 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): Answered over IPv6 with a server error (HTTP 530) — can't tell whether that's specific to IPv6.
    https://pro-cars.info/ via 2606:4700:3033::ac43:a4fa -> HTTP 530, certificate: valid
DNS answers via DNS-over-HTTPS (Cloudflare). Method: https://aaaa.bot/method
Permanent link: https://aaaa.bot/r/ei_JmUzTXf

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

Checked 2026-11-06 20:24:27 UTC. Full DNS report: dns.pizza/domain/pro-cars.info · Age, certificate and blocklists: how.is/pro-cars.info · JSON: /api/v1/pro-cars.info