Yes — classylabs.net has IPv6.

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

IPv6 readiness

Website, mail and DNS all work over IPv6.

Website over IPv6 classylabs.net has 2 IPv6 addresses and answers on every one we tested. ✓ 2606:4700:3032::ac43:dd7e answers · 443✓ 2606:4700:3037::6815:2660 answers · 443	yes
www over IPv6 www.classylabs.net has 2 IPv6 addresses and answers on every one we tested. ✓ 2606:4700:3032::ac43:dd7e answers · 443✓ 2606:4700:3037::6815:2660 answers · 443	yes
Mail servers (MX) have IPv6 Every mail server has an AAAA record. route3.mx.cloudflare.net ✓route1.mx.cloudflare.net ✓route2.mx.cloudflare.net ✓	yes
Nameservers have IPv6 2 of 2 nameservers checked have an AAAA record, so IPv6-only resolvers can look the domain up. lilyana.ns.cloudflare.com ✓mustafa.ns.cloudflare.com ✓	yes

HTTPS over IPv6 · not part of the grade yet
Answered over IPv6 with a server error (HTTP 530) — can't tell whether that's specific to IPv6.

https://classylabs.net/ via 2606:4700:3032::ac43:dd7e → 530

Nothing keeping you from an A

Nothing to fix
Show it off: add the badge to your README.
[![IPv6](https://aaaa.bot/badge/classylabs.net.svg)](https://aaaa.bot/classylabs.net)

Check again

classylabs.net Has IPv6

A (IPv4)	104.21.38.96 172.67.221.126
AAAA (IPv6)	2606:4700:3032::ac43:dd7e 2606:4700:3037::6815:2660

www.classylabs.net Has IPv6

A (IPv4)	104.21.38.96 172.67.221.126
AAAA (IPv6)	2606:4700:3032::ac43:dd7e 2606:4700:3037::6815:2660

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: classylabs.net
Measured 2026-11-14 12:05:35 UTC by aaaa.bot (one server on Fly.io, region iad)

A (IPv4):    104.21.38.96, 172.67.221.126
AAAA (IPv6): 2606:4700:3032::ac43:dd7e, 2606:4700:3037::6815:2660
www AAAA:    2606:4700:3032::ac43:dd7e, 2606:4700:3037::6815:2660

Readiness grade A: Website, mail and DNS all work over IPv6.
- Website over IPv6: classylabs.net has 2 IPv6 addresses and answers on every one we tested.
    2606:4700:3032::ac43:dd7e: answers (TCP 443)
    2606:4700:3037::6815:2660: answers (TCP 443)
- www over IPv6: www.classylabs.net has 2 IPv6 addresses and answers on every one we tested.
    2606:4700:3032::ac43:dd7e: answers (TCP 443)
    2606:4700:3037::6815:2660: answers (TCP 443)
- Mail servers (MX) have IPv6: Every mail server 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): Answered over IPv6 with a server error (HTTP 530) — can't tell whether that's specific to IPv6.
    https://classylabs.net/ via 2606:4700:3032::ac43:dd7e -> HTTP 530, certificate: valid
DNS answers via DNS-over-HTTPS (Cloudflare). Method: https://aaaa.bot/method
Permanent link: https://aaaa.bot/r/eIupUgmf-J

Permanent link: aaaa.bot/r/eIupUgmf-J · How we measure

Checked 2026-11-14 12:05:35 UTC. Full DNS report: dns.pizza/domain/classylabs.net · Age, certificate and blocklists: how.is/classylabs.net · JSON: /api/v1/classylabs.net