Yes — non.cat has IPv6.

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

B
IPv6 readiness
Works over IPv6, with one gap: www doesn't fully work over IPv6.
Website over IPv6
non.cat has 2 IPv6 addresses and answers on every one we tested.
✓ 2606:4700:3031::6815:3e19 answers · 443✓ 2606:4700:3035::ac43:db16 answers · 443
yes
www over IPv6
www.non.cat has no AAAA record.		no
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.
nia.ns.cloudflare.com ✓kolton.ns.cloudflare.com ✓
yes
HTTPS over IPv6 · not part of the grade yet
Loads over IPv6 with a valid certificate: HTTP 200.
https://non.cat/ via 2606:4700:3031::6815:3e19 → 200
works
 Which outside scripts, fonts, payments or chat non.cat loads from have no IPv6.
 Load non.cat over IPv6 from up to six other places — a second opinion.

What's keeping non.cat from an A

  1. Add IPv6 for www.non.cat
    www.non.cat has no AAAA record. Get www's IPv6 address from whoever hosts www and add it as an AAAA record. If the same server already serves both names (and its certificate covers www), you can reuse non.cat's AAAA record(s) for www. How to add an AAAA record

Check again

non.cat  Has IPv6

A (IPv4)104.21.62.25
172.67.219.22
AAAA (IPv6)2606:4700:3031::6815:3e19
2606:4700:3035::ac43:db16

www.non.cat  No address

A (IPv4)none
AAAA (IPv6)none

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/Vf_V4QMGEm · How we measure

Checked 2026-11-11 05:24:50 UTC. Full DNS report: dns.pizza/domain/non.cat · Age, certificate and blocklists: how.is/non.cat · JSON: /api/v1/non.cat