Yes — lynceuschess.app has IPv6.

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

This is a saved measurement from 2026-11-04 16:22 UTC. Check lynceuschess.app live now

IPv6 readiness

Website, mail and DNS all work over IPv6.

Website over IPv6 lynceuschess.app has 2 IPv6 addresses and answers on every one we tested. ✓ 2606:4700:3035::6815:4fe3 answers · 443✓ 2606:4700:3037::ac43:954a 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. chase.ns.cloudflare.com ✓monroe.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://lynceuschess.app/ via 2606:4700:3035::6815:4fe3 → 302https://wandering-bonus-712d.cloudflareaccess.com/cdn-cgi/access/login/lynceuschess.app?kid=f5d9d2f2ab87e3fc33fa825316c8b2bb2d99af3d7133cb71690ff5c5a7ad3f44&meta=eyJ0eXAiOiJKV1QiLCJhbGciOiJSUzI1NiIsImtpZCI6ImY2MDc5OTI2MTU0OWZjM2Q2OGZhODVlYzkwOWYyOGMyOWU0YTc5NDc0MDRlMzdhYzM4ZDJmYjQ2NTM3OGYwYzAifQ.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.G_7hvb_d98zTVPaOt4yjoYEVpUmOaxsdriCNsXPmkHZDn4m4TngKGvCM9OdxLB93LlmdvABto57_1HsHhooooNj1XL0-FM0Qm91Z01_ROZaBdaTxMc2uRrPBWtwSWMQTdLm634nxzQDP8Nl_g06liMD_6rLe8BrUp6RNykkhwWrjOtFK0L8fun2T7aifS_hErstZLKPEsTIccXSTXAMKB3b_6CfELyXLWdbicPmXQKMLskHLC3uETNBAg8nvnP26pITAkjtJht7i6cWjwRwyKLY8x1QUPkgAjrnBdud5Cl48sQqfpDZGh-pMva3KH9kpZTyoCzXVhXrRoyKBH3L2kA&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/lynceuschess.app.svg)](https://aaaa.bot/lynceuschess.app)

Check again

lynceuschess.app Has IPv6

A (IPv4)	104.21.79.227 172.67.149.74
AAAA (IPv6)	2606:4700:3035::6815:4fe3 2606:4700:3037::ac43:954a

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: lynceuschess.app
Measured 2026-11-04 16:22:48 UTC by aaaa.bot (one server on Fly.io, region iad)

A (IPv4):    104.21.79.227, 172.67.149.74
AAAA (IPv6): 2606:4700:3035::6815:4fe3, 2606:4700:3037::ac43:954a

Readiness grade A: Website, mail and DNS all work over IPv6.
- Website over IPv6: lynceuschess.app has 2 IPv6 addresses and answers on every one we tested.
    2606:4700:3035::6815:4fe3: answers (TCP 443)
    2606:4700:3037::ac43:954a: 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://lynceuschess.app/ via 2606:4700:3035::6815:4fe3 -> HTTP 302, certificate: valid
    https://wandering-bonus-712d.cloudflareaccess.com/cdn-cgi/access/login/lynceuschess.app?kid=f5d9d2f2ab87e3fc33fa825316c8b2bb2d99af3d7133cb71690ff5c5a7ad3f44&meta=eyJ0eXAiOiJKV1QiLCJhbGciOiJSUzI1NiIsImtpZCI6ImY2MDc5OTI2MTU0OWZjM2Q2OGZhODVlYzkwOWYyOGMyOWU0YTc5NDc0MDRlMzdhYzM4ZDJmYjQ2NTM3OGYwYzAifQ.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.G_7hvb_d98zTVPaOt4yjoYEVpUmOaxsdriCNsXPmkHZDn4m4TngKGvCM9OdxLB93LlmdvABto57_1HsHhooooNj1XL0-FM0Qm91Z01_ROZaBdaTxMc2uRrPBWtwSWMQTdLm634nxzQDP8Nl_g06liMD_6rLe8BrUp6RNykkhwWrjOtFK0L8fun2T7aifS_hErstZLKPEsTIccXSTXAMKB3b_6CfELyXLWdbicPmXQKMLskHLC3uETNBAg8nvnP26pITAkjtJht7i6cWjwRwyKLY8x1QUPkgAjrnBdud5Cl48sQqfpDZGh-pMva3KH9kpZTyoCzXVhXrRoyKBH3L2kA&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/whk7srKemA

Permanent link: aaaa.bot/r/whk7srKemA · How we measure

Checked 2026-11-04 16:22:48 UTC. Full DNS report: dns.pizza/domain/lynceuschess.app · Age, certificate and blocklists: how.is/lynceuschess.app · JSON: /api/v1/lynceuschess.app