Yes — yuno.observer has IPv6.

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

IPv6 readiness

Website, mail and DNS all work over IPv6.

Website over IPv6 yuno.observer has 2 IPv6 addresses and answers on every one we tested. ✓ 2606:4700:3035::ac43:bf82 answers · 443✓ 2606:4700:3032::6815:31b0 answers · 443	yes
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. sky.ns.cloudflare.com ✓todd.ns.cloudflare.com ✓	yes

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

https://yuno.observer/ via 2606:4700:3035::ac43:bf82 → 302https://yuno-observer.cloudflareaccess.com/cdn-cgi/access/login/yuno.observer?kid=c64ee0a145506e43f41d4f80ff505102ee6eccb7be0c60de3f0af737c7a4aa70&meta=eyJ0eXAiOiJKV1QiLCJhbGciOiJSUzI1NiIsImtpZCI6Ijg2OGFmMjMzMzMwYTk2ZmFjNTUzMTBhMmQyN2E2MmQ1ZWM1YWY5Zjg3ZDBhOTg5OTNhMzk0MjZlMDg1NGI2NzcifQ.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.Bq1k0YTHf8ClAVZorL6Y-gwSfbcFTxvYcsh4VorFDpwYvTRF1rdwRf62Pdtmo2gXVdRX5WqOEjS5uIMbeqC9zhuyZaK2fvDub4haYScgJY5c2SMAQJzOkOA5DJ8JU8EzZVSihrfSGsvBkLKcL-D8oSA3mPisFJFJewn9fui2gg7tU7z4ftQ9cLlUhVprMwoi4XDYdfzmRKDkDJuxza9ZHpxZgf-B06UiuTpjMLRyqGQus-TsFcMH1JLfw8N-5LfXHawY4U1dfjTarMf0atkcPDfl7VQfnfqVZT2mg3Cdjc0TitZsHiyu86SMgWIA-ZCzqeDbIux0vNI2pTOFOcTq3A&redirect_url=%2F via 2606:4700:300a::6813:c31d → 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/yuno.observer.svg)](https://aaaa.bot/yuno.observer)

Check again

yuno.observer Has IPv6

A (IPv4)	104.21.49.176 172.67.191.130
AAAA (IPv6)	2606:4700:3035::ac43:bf82 2606:4700:3032::6815:31b0

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: yuno.observer
Measured 2026-11-12 04:23:24 UTC by aaaa.bot (one server on Fly.io, region iad)

A (IPv4):    104.21.49.176, 172.67.191.130
AAAA (IPv6): 2606:4700:3035::ac43:bf82, 2606:4700:3032::6815:31b0

Readiness grade A: Website, mail and DNS all work over IPv6.
- Website over IPv6: yuno.observer has 2 IPv6 addresses and answers on every one we tested.
    2606:4700:3035::ac43:bf82: answers (TCP 443)
    2606:4700:3032::6815:31b0: answers (TCP 443)
- Mail servers (MX) have IPv6: No MX records, so mail goes to the domain's own address (implicit MX). It 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): Loads over IPv6 with a valid certificate after 1 redirect: HTTP 200.
    https://yuno.observer/ via 2606:4700:3035::ac43:bf82 -> HTTP 302, certificate: valid
    https://yuno-observer.cloudflareaccess.com/cdn-cgi/access/login/yuno.observer?kid=c64ee0a145506e43f41d4f80ff505102ee6eccb7be0c60de3f0af737c7a4aa70&meta=eyJ0eXAiOiJKV1QiLCJhbGciOiJSUzI1NiIsImtpZCI6Ijg2OGFmMjMzMzMwYTk2ZmFjNTUzMTBhMmQyN2E2MmQ1ZWM1YWY5Zjg3ZDBhOTg5OTNhMzk0MjZlMDg1NGI2NzcifQ.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.Bq1k0YTHf8ClAVZorL6Y-gwSfbcFTxvYcsh4VorFDpwYvTRF1rdwRf62Pdtmo2gXVdRX5WqOEjS5uIMbeqC9zhuyZaK2fvDub4haYScgJY5c2SMAQJzOkOA5DJ8JU8EzZVSihrfSGsvBkLKcL-D8oSA3mPisFJFJewn9fui2gg7tU7z4ftQ9cLlUhVprMwoi4XDYdfzmRKDkDJuxza9ZHpxZgf-B06UiuTpjMLRyqGQus-TsFcMH1JLfw8N-5LfXHawY4U1dfjTarMf0atkcPDfl7VQfnfqVZT2mg3Cdjc0TitZsHiyu86SMgWIA-ZCzqeDbIux0vNI2pTOFOcTq3A&redirect_url=%2F via 2606:4700:300a::6813:c31d -> HTTP 200, certificate: valid
DNS answers via DNS-over-HTTPS (Cloudflare). Method: https://aaaa.bot/method
Permanent link: https://aaaa.bot/r/1Gxqt9Iqmj

Permanent link: aaaa.bot/r/1Gxqt9Iqmj · How we measure

Checked 2026-11-12 04:23:24 UTC. Full DNS report: dns.pizza/domain/yuno.observer · Age, certificate and blocklists: how.is/yuno.observer · JSON: /api/v1/yuno.observer