Yes — firefox-portal-detection.com has IPv6.

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

This is a saved measurement from 2026-10-30 18:04 UTC. Check firefox-portal-detection.com live now

A
IPv6 readiness
Website, mail and DNS all work over IPv6.
Website over IPv6
firefox-portal-detection.com has 4 IPv6 addresses and answers on every one we tested.
✓ 2a04:4e42:200::347 answers · 443✓ 2a04:4e42:600::347 answers · 443✓ 2a04:4e42:400::347 answers · 443✓ 2a04:4e42::347 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
4 of 4 nameservers checked have an AAAA record, so IPv6-only resolvers can look the domain up.
ns-cloud-d2.googledomains.com ✓ns-cloud-d3.googledomains.com ✓ns-cloud-d4.googledomains.com ✓ns-cloud-d1.googledomains.com ✓
yes
HTTPS over IPv6 · not part of the grade yet
Loads over IPv6 with a valid certificate: HTTP 200.
https://firefox-portal-detection.com/ via 2a04:4e42:400::347 → 200
works

Nothing keeping you from an A

  1. Nothing to fix
    Show it off: add the badge to your README.
    [![IPv6](https://aaaa.bot/badge/firefox-portal-detection.com.svg)](https://aaaa.bot/firefox-portal-detection.com)

Check again

firefox-portal-detection.com  Has IPv6

A (IPv4)151.101.193.91
151.101.1.91
151.101.65.91
151.101.129.91
AAAA (IPv6)2a04:4e42:200::347
2a04:4e42:600::347
2a04:4e42:400::347
2a04:4e42::347

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

 Permanent link: aaaa.bot/r/aDfUI4n5I6 · How we measure

Checked 2026-10-30 18:04:34 UTC. Full DNS report: dns.pizza/domain/firefox-portal-detection.com · JSON: /api/v1/firefox-portal-detection.com