Yes — cloudflare.net has IPv6.

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

This is a saved measurement from 2026-10-31 02:06 UTC. Check cloudflare.net live now

IPv6 readiness

Works over IPv6, with one gap: its mail servers lack IPv6.

Website over IPv6 cloudflare.net has 2 IPv6 addresses and answers on every one we tested. ✓ 2606:4700::6810:d05a answers · 443✓ 2606:4700::6811:9c55 answers · 443	yes
www over IPv6 www.cloudflare.net has 2 IPv6 addresses and answers on every one we tested. ✓ 2606:4700::6810:d05a answers · 443✓ 2606:4700::6811:9c55 answers · 443	yes
Mail servers (MX) have IPv6 None of the mail servers has an AAAA record. mailstream-canary.mxrecord.io ✗mailstream-east.mxrecord.io ✗mailstream-west.mxrecord.io ✗mailstream-central.mxrecord.mx ✗	no
Nameservers have IPv6 5 of 5 nameservers checked have an AAAA record, so IPv6-only resolvers can look the domain up. ns1.cloudflare.net ✓ns2.cloudflare.net ✓ns3.cloudflare.net ✓ns4.cloudflare.net ✓ns5.cloudflare.net ✓	yes

HTTPS over IPv6 · not part of the grade yet
Loads over IPv6 with a valid certificate: HTTP 403.

https://cloudflare.net/ via 2606:4700::6810:d05a → 403

works

What's keeping cloudflare.net from an A

Mail servers without IPv6
mailstream-canary.mxrecord.io, mailstream-east.mxrecord.io, mailstream-west.mxrecord.io, mailstream-central.mxrecord.mx 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

cloudflare.net Has IPv6

A (IPv4)	104.16.208.90 104.17.156.85
AAAA (IPv6)	2606:4700::6810:d05a 2606:4700::6811:9c55

www.cloudflare.net Has IPv6

A (IPv4)	104.16.208.90 104.17.156.85
AAAA (IPv6)	2606:4700::6810:d05a 2606:4700::6811:9c55

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: cloudflare.net
Measured 2026-10-31 02:06:14 UTC by aaaa.bot (one server on Fly.io, region iad)

A (IPv4):    104.16.208.90, 104.17.156.85
AAAA (IPv6): 2606:4700::6810:d05a, 2606:4700::6811:9c55
www AAAA:    2606:4700::6810:d05a, 2606:4700::6811:9c55

Readiness grade B: Works over IPv6, with one gap: its mail servers lack IPv6.
- Website over IPv6: cloudflare.net has 2 IPv6 addresses and answers on every one we tested.
    2606:4700::6810:d05a: answers (TCP 443)
    2606:4700::6811:9c55: answers (TCP 443)
- www over IPv6: www.cloudflare.net has 2 IPv6 addresses and answers on every one we tested.
    2606:4700::6810:d05a: answers (TCP 443)
    2606:4700::6811:9c55: answers (TCP 443)
- Mail servers (MX) have IPv6: None of the mail servers has an AAAA record.
- Nameservers have IPv6: 5 of 5 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 403.
    https://cloudflare.net/ via 2606:4700::6810:d05a -> HTTP 403, certificate: valid
DNS answers via DNS-over-HTTPS (Cloudflare). Method: https://aaaa.bot/method
Permanent link: https://aaaa.bot/r/htmWds7Xh3

Permanent link: aaaa.bot/r/htmWds7Xh3 · How we measure

Checked 2026-10-31 02:06:14 UTC. Full DNS report: dns.pizza/domain/cloudflare.net · JSON: /api/v1/cloudflare.net