Yes — concret18731.online has IPv6.

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

IPv6 readiness

Website, mail and DNS all work over IPv6.

Website over IPv6 concret18731.online has 2 IPv6 addresses and answers on every one we tested. ✓ 2a02:4780:84:2868:b4ee:6efd:7200:fb8c answers · 443✓ 2a02:4780:84:14ec:a8cf:8063:1b7d:db83 answers · 443	yes
www over IPv6 www.concret18731.online has 2 IPv6 addresses and answers on every one we tested. ✓ 2a02:4780:84:fac3:8b7e:18af:2093:a868 answers · 443✓ 2a02:4780:84:5c38:dc5b:576:7c34:c649 answers · 443	yes
Mail servers (MX) have IPv6 No MX records, so mail goes to the domain's own address (implicit MX). It has an AAAA record.	yes
Nameservers have IPv6 2 of 2 nameservers checked have an AAAA record, so IPv6-only resolvers can look the domain up. lunar.dns-parking.com ✓solar.dns-parking.com ✓	yes

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

https://concret18731.online/ via 2a02:4780:84:2868:b4ee:6efd:7200:fb8c → 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/concret18731.online.svg)](https://aaaa.bot/concret18731.online)

Check again

concret18731.online Has IPv6

A (IPv4)	88.222.222.149 84.32.84.85
AAAA (IPv6)	2a02:4780:84:2868:b4ee:6efd:7200:fb8c 2a02:4780:84:14ec:a8cf:8063:1b7d:db83

www.concret18731.online Has IPv6

Alias of	www.concret18731.online.cdn.hstgr.net
A (IPv4)	88.222.222.182 84.32.84.202
AAAA (IPv6)	2a02:4780:84:fac3:8b7e:18af:2093:a868 2a02:4780:84:5c38:dc5b:576:7c34:c649

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: concret18731.online
Measured 2026-11-14 14:32:20 UTC by aaaa.bot (one server on Fly.io, region iad)

A (IPv4):    88.222.222.149, 84.32.84.85
AAAA (IPv6): 2a02:4780:84:2868:b4ee:6efd:7200:fb8c, 2a02:4780:84:14ec:a8cf:8063:1b7d:db83
www AAAA:    2a02:4780:84:fac3:8b7e:18af:2093:a868, 2a02:4780:84:5c38:dc5b:576:7c34:c649

Readiness grade A: Website, mail and DNS all work over IPv6.
- Website over IPv6: concret18731.online has 2 IPv6 addresses and answers on every one we tested.
    2a02:4780:84:2868:b4ee:6efd:7200:fb8c: answers (TCP 443)
    2a02:4780:84:14ec:a8cf:8063:1b7d:db83: answers (TCP 443)
- www over IPv6: www.concret18731.online has 2 IPv6 addresses and answers on every one we tested.
    2a02:4780:84:fac3:8b7e:18af:2093:a868: answers (TCP 443)
    2a02:4780:84:5c38:dc5b:576:7c34:c649: answers (TCP 443)
- Mail servers (MX) have IPv6: No MX records, so mail goes to the domain's own address (implicit MX). It 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): Loads over IPv6 with a valid certificate: HTTP 200.
    https://concret18731.online/ via 2a02:4780:84:2868:b4ee:6efd:7200:fb8c -> HTTP 200, certificate: valid
DNS answers via DNS-over-HTTPS (Cloudflare). Method: https://aaaa.bot/method
Permanent link: https://aaaa.bot/r/1dccl5MF3u

Permanent link: aaaa.bot/r/1dccl5MF3u · How we measure

Checked 2026-11-14 14:32:20 UTC. Full DNS report: dns.pizza/domain/concret18731.online · Age, certificate and blocklists: how.is/concret18731.online · JSON: /api/v1/concret18731.online