Yes — mattlydb.fyi has IPv6.

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

IPv6 readiness

Website, mail and DNS all work over IPv6.

Website over IPv6 mattlydb.fyi has 2 IPv6 addresses and answers on every one we tested. ✓ 2606:4700:3036::6815:42b9 answers · 443✓ 2606:4700:3032::ac43:cec5 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. houston.ns.cloudflare.com ✓wren.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://mattlydb.fyi/ via 2606:4700:3036::6815:42b9 → 302https://young-recipe-7353.cloudflareaccess.com/cdn-cgi/access/login/mattlydb.fyi?kid=8b84921ef0dddc9cec79a42bb97278fd14f3c3321bf23fd0c8ab6ab568869b9c&meta=eyJ0eXAiOiJKV1QiLCJhbGciOiJSUzI1NiIsImtpZCI6Ijg3YmFjMzUyOGM0ZGE0ODIwOTRkODEwZGE1MTk1YWU1NGNhNDc4NDk3N2YwNGVlOWZjYmI4NDgzMzQ0OGRiOTIifQ.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.BSJUcq9iBw_HGrNdf82WFHczq43Kqmz2eCV1q5luL4bRzwTzURFsWl3N2KAugB6TSrabh6ijdoGjiJjxQ7G6dQgxx4GoATjbh2vFxGJ-1hvvstMPwHlf3N75K-zlAdDd-Ggp18PdWjZHCQI9yp9oIg3fu00iKZQGTle0AZGC_6gUmCwjNGJz9C3_J8yx2xbUG6YXSkQRXWjN301HrVxLoy6RYY7dsbLhhfh2_2HFW0NQVC_J4T4cQyf8uiW5U4S_2RBwSMKnvSi3kXLKJeHtH6KLTOeXHTJFg509b68bKJwRl9BDgn2L-CpIUT85GjFuUf_Lr92Oi0UYNwpeNiRWKg&redirect_url=%2F via 2606:4700:300a::6813:c21d → 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/mattlydb.fyi.svg)](https://aaaa.bot/mattlydb.fyi)

Check again

mattlydb.fyi Has IPv6

A (IPv4)	172.67.206.197 104.21.66.185
AAAA (IPv6)	2606:4700:3036::6815:42b9 2606:4700:3032::ac43:cec5

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: mattlydb.fyi
Measured 2026-11-05 23:03:18 UTC by aaaa.bot (one server on Fly.io, region iad)

A (IPv4):    172.67.206.197, 104.21.66.185
AAAA (IPv6): 2606:4700:3036::6815:42b9, 2606:4700:3032::ac43:cec5

Readiness grade A: Website, mail and DNS all work over IPv6.
- Website over IPv6: mattlydb.fyi has 2 IPv6 addresses and answers on every one we tested.
    2606:4700:3036::6815:42b9: answers (TCP 443)
    2606:4700:3032::ac43:cec5: 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://mattlydb.fyi/ via 2606:4700:3036::6815:42b9 -> HTTP 302, certificate: valid
    https://young-recipe-7353.cloudflareaccess.com/cdn-cgi/access/login/mattlydb.fyi?kid=8b84921ef0dddc9cec79a42bb97278fd14f3c3321bf23fd0c8ab6ab568869b9c&meta=eyJ0eXAiOiJKV1QiLCJhbGciOiJSUzI1NiIsImtpZCI6Ijg3YmFjMzUyOGM0ZGE0ODIwOTRkODEwZGE1MTk1YWU1NGNhNDc4NDk3N2YwNGVlOWZjYmI4NDgzMzQ0OGRiOTIifQ.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.BSJUcq9iBw_HGrNdf82WFHczq43Kqmz2eCV1q5luL4bRzwTzURFsWl3N2KAugB6TSrabh6ijdoGjiJjxQ7G6dQgxx4GoATjbh2vFxGJ-1hvvstMPwHlf3N75K-zlAdDd-Ggp18PdWjZHCQI9yp9oIg3fu00iKZQGTle0AZGC_6gUmCwjNGJz9C3_J8yx2xbUG6YXSkQRXWjN301HrVxLoy6RYY7dsbLhhfh2_2HFW0NQVC_J4T4cQyf8uiW5U4S_2RBwSMKnvSi3kXLKJeHtH6KLTOeXHTJFg509b68bKJwRl9BDgn2L-CpIUT85GjFuUf_Lr92Oi0UYNwpeNiRWKg&redirect_url=%2F via 2606:4700:300a::6813:c21d -> HTTP 200, certificate: valid
DNS answers via DNS-over-HTTPS (Cloudflare). Method: https://aaaa.bot/method
Permanent link: https://aaaa.bot/r/2zOIEmf49Y

Permanent link: aaaa.bot/r/2zOIEmf49Y · How we measure

Checked 2026-11-05 23:03:18 UTC. Full DNS report: dns.pizza/domain/mattlydb.fyi · Age, certificate and blocklists: how.is/mattlydb.fyi · JSON: /api/v1/mattlydb.fyi