Yes — fmtd.app has IPv6.

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

This is a saved measurement from 2026-10-31 15:58 UTC. Check fmtd.app live now

IPv6 readiness

Website, mail and DNS all work over IPv6.

Website over IPv6 fmtd.app has 2 IPv6 addresses and answers on every one we tested. ✓ 2606:4700:3037::ac43:9566 answers · 443✓ 2606:4700:3030::6815:1d94 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. chan.ns.cloudflare.com ✓chase.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://fmtd.app/ via 2606:4700:3037::ac43:9566 → 302https://damp-lab-d020.cloudflareaccess.com/cdn-cgi/access/login/fmtd.app?kid=ea516bca4d5b4ccae8b0bc62aa2b895d0e21182e980f50eafe56b49f43296172&meta=eyJ0eXAiOiJKV1QiLCJhbGciOiJSUzI1NiIsImtpZCI6Ijg2OGFmMjMzMzMwYTk2ZmFjNTUzMTBhMmQyN2E2MmQ1ZWM1YWY5Zjg3ZDBhOTg5OTNhMzk0MjZlMDg1NGI2NzcifQ.eyJ0eXBlIjoibWV0YSIsImF1ZCI6ImVhNTE2YmNhNGQ1YjRjY2FlOGIwYmM2MmFhMmI4OTVkMGUyMTE4MmU5ODBmNTBlYWZlNTZiNDlmNDMyOTYxNzIiLCJob3N0bmFtZSI6ImZtdGQuYXBwIiwicmVkaXJlY3RfdXJsIjoiLyIsInNlcnZpY2VfdG9rZW5fc3RhdHVzIjpmYWxzZSwiaXNfd2FycCI6ZmFsc2UsImlzX2dhdGV3YXkiOmZhbHNlLCJleHAiOjE3OTM0NjI2MTksIm5iZiI6MTc5MzQ2MjMxOSwiaWF0IjoxNzkzNDYyMzE5LCJhdXRoX3N0YXR1cyI6Ik5PTkUiLCJtdGxzX2F1dGgiOnsiY2VydF9pc3N1ZXJfZG4iOiIiLCJjZXJ0X3NlcmlhbCI6IiIsImNlcnRfaXNzdWVyX3NraSI6IiIsImNlcnRfcHJlc2VudGVkIjpmYWxzZSwiY29tbW9uX25hbWUiOiIiLCJhdXRoX3N0YXR1cyI6Ik5PTkUifSwicmVhbF9jb3VudHJ5IjoiVVMiLCJhcHBfc2Vzc2lvbl9oYXNoIjoiZTdhZjE2Nzc5NTdlNmUzMWQ2OWFhOWY0ZmU5ZTMxY2QwN2NjNDMzMjBiNzdmYWMwOWMyZTZhZDk0OTQxNDU2ZSJ9.RNfu1Byqqh3MD0nOtn0RU7SGDjM-H2R-lxNEJMXQpzy_HJQ74wHftvpBpdwu71FDkiBSNT1xybJcVYuoK8r07ECadnu3wl7TdXWqXVBxmKTxvECz2cgNxyevGyOEf_vbQExTwk3UK4rrl7-X0b1hc433LSLqzVZ--FDZ_bdEh_Qj3kKH-A2nhXY8Kk8YVlZvWkqHYll_pffnyZKTw4jsblGYTtwKx7bCWikeG_Qrx9FXQl8H5OZrW2izMbe5leDoDaY_0WWhUpMm5-T7G-dBcxCg8K_KGVBwmx1GWaJvSsTMLnz59JTl1_BspMmyQFBOGu4WGMLxnJrcjDzYx4201Q&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/fmtd.app.svg)](https://aaaa.bot/fmtd.app)

Check again

fmtd.app Has IPv6

A (IPv4)	104.21.29.148 172.67.149.102
AAAA (IPv6)	2606:4700:3037::ac43:9566 2606:4700:3030::6815:1d94

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: fmtd.app
Measured 2026-10-31 15:58:39 UTC by aaaa.bot (one server on Fly.io, region iad)

A (IPv4):    104.21.29.148, 172.67.149.102
AAAA (IPv6): 2606:4700:3037::ac43:9566, 2606:4700:3030::6815:1d94

Readiness grade A: Website, mail and DNS all work over IPv6.
- Website over IPv6: fmtd.app has 2 IPv6 addresses and answers on every one we tested.
    2606:4700:3037::ac43:9566: answers (TCP 443)
    2606:4700:3030::6815:1d94: 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://fmtd.app/ via 2606:4700:3037::ac43:9566 -> HTTP 302, certificate: valid
    https://damp-lab-d020.cloudflareaccess.com/cdn-cgi/access/login/fmtd.app?kid=ea516bca4d5b4ccae8b0bc62aa2b895d0e21182e980f50eafe56b49f43296172&meta=eyJ0eXAiOiJKV1QiLCJhbGciOiJSUzI1NiIsImtpZCI6Ijg2OGFmMjMzMzMwYTk2ZmFjNTUzMTBhMmQyN2E2MmQ1ZWM1YWY5Zjg3ZDBhOTg5OTNhMzk0MjZlMDg1NGI2NzcifQ.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.RNfu1Byqqh3MD0nOtn0RU7SGDjM-H2R-lxNEJMXQpzy_HJQ74wHftvpBpdwu71FDkiBSNT1xybJcVYuoK8r07ECadnu3wl7TdXWqXVBxmKTxvECz2cgNxyevGyOEf_vbQExTwk3UK4rrl7-X0b1hc433LSLqzVZ--FDZ_bdEh_Qj3kKH-A2nhXY8Kk8YVlZvWkqHYll_pffnyZKTw4jsblGYTtwKx7bCWikeG_Qrx9FXQl8H5OZrW2izMbe5leDoDaY_0WWhUpMm5-T7G-dBcxCg8K_KGVBwmx1GWaJvSsTMLnz59JTl1_BspMmyQFBOGu4WGMLxnJrcjDzYx4201Q&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/YOvKWGLwFD

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

Checked 2026-10-31 15:58:39 UTC. Full DNS report: dns.pizza/domain/fmtd.app · JSON: /api/v1/fmtd.app