Yes — luchs.app has IPv6.

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

IPv6 readiness

Website, mail and DNS all work over IPv6.

Website over IPv6 luchs.app has 2 IPv6 addresses and answers on every one we tested. ✓ 2606:4700:3037::6815:328f answers · 443✓ 2606:4700:3037::ac43:cefe 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. alexa.ns.cloudflare.com ✓rene.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://luchs.app/ via 2606:4700:3037::6815:328f → 302https://late-sound-8d11.cloudflareaccess.com/cdn-cgi/access/login/luchs.app?kid=647005cc4b7fa7bf1d30935bd2ab977330851f1e97f15e22dfe50cafa3be9e6b&meta=eyJ0eXAiOiJKV1QiLCJhbGciOiJSUzI1NiIsImtpZCI6Ijg2OGFmMjMzMzMwYTk2ZmFjNTUzMTBhMmQyN2E2MmQ1ZWM1YWY5Zjg3ZDBhOTg5OTNhMzk0MjZlMDg1NGI2NzcifQ.eyJ0eXBlIjoibWV0YSIsImF1ZCI6IjY0NzAwNWNjNGI3ZmE3YmYxZDMwOTM1YmQyYWI5NzczMzA4NTFmMWU5N2YxNWUyMmRmZTUwY2FmYTNiZTllNmIiLCJob3N0bmFtZSI6Imx1Y2hzLmFwcCIsInJlZGlyZWN0X3VybCI6Ii8iLCJzZXJ2aWNlX3Rva2VuX3N0YXR1cyI6ZmFsc2UsImlzX3dhcnAiOmZhbHNlLCJpc19nYXRld2F5IjpmYWxzZSwiZXhwIjoxNzk0MDg4MjAzLCJuYmYiOjE3OTQwODc5MDMsImlhdCI6MTc5NDA4NzkwMywiYXV0aF9zdGF0dXMiOiJOT05FIiwibXRsc19hdXRoIjp7ImNlcnRfaXNzdWVyX2RuIjoiIiwiY2VydF9zZXJpYWwiOiIiLCJjZXJ0X2lzc3Vlcl9za2kiOiIiLCJjZXJ0X3ByZXNlbnRlZCI6ZmFsc2UsImNvbW1vbl9uYW1lIjoiIiwiYXV0aF9zdGF0dXMiOiJOT05FIn0sInJlYWxfY291bnRyeSI6IlVTIiwiYXBwX3Nlc3Npb25faGFzaCI6IjAwNTdlYzEzYzhmMWEzMmQzNTgyMzQ2YWZkNWYzYmYyNDBjNWJhNGI2NGE4OWMwNjgwZmZlZjE0NTA0NjAzMGUifQ.Q5nMrPm9NDUIfjbjAG4edbWVauNqfveir5lwUbEPLn43ga9IZuI_Xcsi1JdxH2Q-sOJcs7dQBc8epUX69bfDIJlSj2H0aYOY1_Jn8m4CKf9IsszBFEZNH5UQGwki-Ff8NCmmQJSb_YfMjdPJcWWj15jHUuU5Tzt40qtkPonSURffrLc-9ndHQVxP4jeO-XHa5Tt4Okny9kM0eTzY4zh551WwqKYjLC7tOlWHxw3-3ozHKozVntBo_kMrsWbXg3SQQtaqdkbLQSHYgwQTS-6uJT3bJdoeEGxY6LEaEgO_zmF_GpS4tWLkK4HshxBjYhVnry1ISV7YLL3W38VlwHjmfQ&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/luchs.app.svg)](https://aaaa.bot/luchs.app)

Check again

luchs.app Has IPv6

A (IPv4)	104.21.50.143 172.67.206.254
AAAA (IPv6)	2606:4700:3037::6815:328f 2606:4700:3037::ac43:cefe

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: luchs.app
Measured 2026-11-07 21:45:03 UTC by aaaa.bot (one server on Fly.io, region iad)

A (IPv4):    104.21.50.143, 172.67.206.254
AAAA (IPv6): 2606:4700:3037::6815:328f, 2606:4700:3037::ac43:cefe

Readiness grade A: Website, mail and DNS all work over IPv6.
- Website over IPv6: luchs.app has 2 IPv6 addresses and answers on every one we tested.
    2606:4700:3037::6815:328f: answers (TCP 443)
    2606:4700:3037::ac43:cefe: 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://luchs.app/ via 2606:4700:3037::6815:328f -> HTTP 302, certificate: valid
    https://late-sound-8d11.cloudflareaccess.com/cdn-cgi/access/login/luchs.app?kid=647005cc4b7fa7bf1d30935bd2ab977330851f1e97f15e22dfe50cafa3be9e6b&meta=eyJ0eXAiOiJKV1QiLCJhbGciOiJSUzI1NiIsImtpZCI6Ijg2OGFmMjMzMzMwYTk2ZmFjNTUzMTBhMmQyN2E2MmQ1ZWM1YWY5Zjg3ZDBhOTg5OTNhMzk0MjZlMDg1NGI2NzcifQ.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.Q5nMrPm9NDUIfjbjAG4edbWVauNqfveir5lwUbEPLn43ga9IZuI_Xcsi1JdxH2Q-sOJcs7dQBc8epUX69bfDIJlSj2H0aYOY1_Jn8m4CKf9IsszBFEZNH5UQGwki-Ff8NCmmQJSb_YfMjdPJcWWj15jHUuU5Tzt40qtkPonSURffrLc-9ndHQVxP4jeO-XHa5Tt4Okny9kM0eTzY4zh551WwqKYjLC7tOlWHxw3-3ozHKozVntBo_kMrsWbXg3SQQtaqdkbLQSHYgwQTS-6uJT3bJdoeEGxY6LEaEgO_zmF_GpS4tWLkK4HshxBjYhVnry1ISV7YLL3W38VlwHjmfQ&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/VWOURflOMM

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

Checked 2026-11-07 21:45:03 UTC. Full DNS report: dns.pizza/domain/luchs.app · Age, certificate and blocklists: how.is/luchs.app · JSON: /api/v1/luchs.app