Yes — sleepytech.app has IPv6.

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

B
IPv6 readiness
Works over IPv6, with one gap: its mail servers lack IPv6.
Website over IPv6
sleepytech.app has 2 IPv6 addresses and answers on every one we tested.
✓ 2606:4700:3030::ac43:af50 answers · 443✓ 2606:4700:3030::6815:1152 answers · 443
yes
Mail servers (MX) have IPv6
None of the mail servers has an AAAA record.
mx01.mail.icloud.com ✗mx02.mail.icloud.com ✗
no
Nameservers have IPv6
2 of 2 nameservers checked have an AAAA record, so IPv6-only resolvers can look the domain up.
jason.ns.cloudflare.com ✓shaz.ns.cloudflare.com ✓
yes
HTTPS over IPv6 · not part of the grade yet
Loads over IPv6 with a valid certificate: HTTP 403.
https://sleepytech.app/ via 2606:4700:3030::ac43:af50 → 403
works
 Load sleepytech.app over IPv6 from up to six other places — a second opinion.

What's keeping sleepytech.app from an A

  1. Mail servers without IPv6
    mx01.mail.icloud.com, mx02.mail.icloud.com 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

sleepytech.app  Has IPv6

A (IPv4)104.21.17.82
172.67.175.80
AAAA (IPv6)2606:4700:3030::ac43:af50
2606:4700:3030::6815:1152

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/jbhQUEar0Y · How we measure

Checked 2026-10-30 16:41:49 UTC. Full DNS report: dns.pizza/domain/sleepytech.app · JSON: /api/v1/sleepytech.app