Yes — firefox.com has IPv6.

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

This is a saved measurement from 2026-10-31 00:04 UTC. Check firefox.com live now

IPv6 readiness

Website, mail and DNS all work over IPv6.

Website over IPv6 firefox.com has an AAAA record and answers on it. ✓ 2600:1901:0:c197:: answers · 443	yes
www over IPv6 www.firefox.com has 4 IPv6 addresses and answers on every one we tested. ✓ 2a04:4e42::787 answers · 443✓ 2a04:4e42:600::787 answers · 443✓ 2a04:4e42:400::787 answers · 443✓ 2a04:4e42:200::787 answers · 443	yes
Mail servers (MX) have IPv6 Every mail server has an AAAA record. smtp.google.com ✓	yes
Nameservers have IPv6 1 of 4 nameservers checked have an AAAA record, so IPv6-only resolvers can look the domain up. ns4-64.akam.net ✗ns5-65.akam.net ✗ns7-66.akam.net ✗ns1-240.akam.net ✓	yes

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

https://firefox.com/ via 2600:1901:0:c197:: → 301https://www.firefox.com/ via 2a04:4e42::787 → 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/firefox.com.svg)](https://aaaa.bot/firefox.com)

Check again

firefox.com Has IPv6

A (IPv4)	35.190.14.201
AAAA (IPv6)	2600:1901:0:c197::

www.firefox.com Has IPv6

A (IPv4)	151.101.131.19 151.101.3.19 151.101.195.19 151.101.67.19
AAAA (IPv6)	2a04:4e42::787 2a04:4e42:600::787 2a04:4e42:400::787 2a04:4e42:200::787

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: firefox.com
Measured 2026-10-31 00:04:31 UTC by aaaa.bot (one server on Fly.io, region iad)

A (IPv4):    35.190.14.201
AAAA (IPv6): 2600:1901:0:c197::
www AAAA:    2a04:4e42::787, 2a04:4e42:600::787, 2a04:4e42:400::787, 2a04:4e42:200::787

Readiness grade A: Website, mail and DNS all work over IPv6.
- Website over IPv6: firefox.com has an AAAA record and answers on it.
    2600:1901:0:c197::: answers (TCP 443)
- www over IPv6: www.firefox.com has 4 IPv6 addresses and answers on every one we tested.
    2a04:4e42::787: answers (TCP 443)
    2a04:4e42:600::787: answers (TCP 443)
    2a04:4e42:400::787: answers (TCP 443)
    2a04:4e42:200::787: answers (TCP 443)
- Mail servers (MX) have IPv6: Every mail server has an AAAA record.
- Nameservers have IPv6: 1 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://firefox.com/ via 2600:1901:0:c197:: -> HTTP 301, certificate: valid
    https://www.firefox.com/ via 2a04:4e42::787 -> HTTP 200, certificate: valid
DNS answers via DNS-over-HTTPS (Cloudflare). Method: https://aaaa.bot/method
Permanent link: https://aaaa.bot/r/1ZFMQaosBg

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

Checked 2026-10-31 00:04:31 UTC. Full DNS report: dns.pizza/domain/firefox.com · JSON: /api/v1/firefox.com