Yes — mustpay.dev has IPv6.

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

IPv6 readiness

Website, mail and DNS all work over IPv6.

Website over IPv6 mustpay.dev has 2 IPv6 addresses and answers on every one we tested. ✓ 2606:4700:3033::6815:4fa0 answers · 443✓ 2606:4700:3037::ac43:9294 answers · 443	yes
www over IPv6 www.mustpay.dev has 2 IPv6 addresses and answers on every one we tested. ✓ 2606:4700:3037::ac43:9294 answers · 443✓ 2606:4700:3033::6815:4fa0 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. gemma.ns.cloudflare.com ✓randall.ns.cloudflare.com ✓	yes

HTTPS over IPv6 · not part of the grade yet
Loads over IPv6 with a valid certificate after 2 redirects: HTTP 200.

https://mustpay.dev/ via 2606:4700:3033::6815:4fa0 → 302https://app.mustpay.dev/ via 2606:4700:3033::6815:4fa0 → 302https://mustpay.cloudflareaccess.com/cdn-cgi/access/login/app.mustpay.dev?kid=986947bd0dc5d26caddf31c8f55cf1f123c0cb4f6e6cedbc47c603298f6e27b2&meta=eyJ0eXAiOiJKV1QiLCJhbGciOiJSUzI1NiIsImtpZCI6ImI3NDJmY2FlNGJlM2U3NmYxNjlhM2FlMTc0N2RhNGNjNTRhYTkzNjQyYjQ4MzM1N2ExMjkxMWM5NmE5NDM4NmUifQ.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.SzMJjI2UELkn765a2BZausodQN5i93XgwhyZbykUZewhEqHWO56nwowLbgslqThPBDI9qSv9iBLftCeBxFR3Bqd9XNDwfZZppGqBU_UNPi0DxNra-eXAQYJZgUU1mwgvQRfuLcsgvNAQoEh7ML2ng3ix2MiYvtf_VribkQKe1WgARTm_Brxx-iqR6f-VJwt4gi5SckYPHyLxtf8p5kBl_PY1S1sLQgFYKNtxyKVrP2Ykoddk0_bdZdRpnr7MN8RdhjtlUezx4dnQVmaE8FvV5z8tsIAPxTzameY9jP8PQ2Vr1ijPU3it4R6gYKSRQkaliIxj-vprY0IKBPEI99vJZQ&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/mustpay.dev.svg)](https://aaaa.bot/mustpay.dev)

Check again

mustpay.dev Has IPv6

A (IPv4)	172.67.146.148 104.21.79.160
AAAA (IPv6)	2606:4700:3033::6815:4fa0 2606:4700:3037::ac43:9294

www.mustpay.dev Has IPv6

A (IPv4)	172.67.146.148 104.21.79.160
AAAA (IPv6)	2606:4700:3037::ac43:9294 2606:4700:3033::6815:4fa0

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: mustpay.dev
Measured 2026-11-10 02:26:26 UTC by aaaa.bot (one server on Fly.io, region iad)

A (IPv4):    172.67.146.148, 104.21.79.160
AAAA (IPv6): 2606:4700:3033::6815:4fa0, 2606:4700:3037::ac43:9294
www AAAA:    2606:4700:3037::ac43:9294, 2606:4700:3033::6815:4fa0

Readiness grade A: Website, mail and DNS all work over IPv6.
- Website over IPv6: mustpay.dev has 2 IPv6 addresses and answers on every one we tested.
    2606:4700:3033::6815:4fa0: answers (TCP 443)
    2606:4700:3037::ac43:9294: answers (TCP 443)
- www over IPv6: www.mustpay.dev has 2 IPv6 addresses and answers on every one we tested.
    2606:4700:3037::ac43:9294: answers (TCP 443)
    2606:4700:3033::6815:4fa0: 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 2 redirects: HTTP 200.
    https://mustpay.dev/ via 2606:4700:3033::6815:4fa0 -> HTTP 302, certificate: valid
    https://app.mustpay.dev/ via 2606:4700:3033::6815:4fa0 -> HTTP 302, certificate: valid
    https://mustpay.cloudflareaccess.com/cdn-cgi/access/login/app.mustpay.dev?kid=986947bd0dc5d26caddf31c8f55cf1f123c0cb4f6e6cedbc47c603298f6e27b2&meta=eyJ0eXAiOiJKV1QiLCJhbGciOiJSUzI1NiIsImtpZCI6ImI3NDJmY2FlNGJlM2U3NmYxNjlhM2FlMTc0N2RhNGNjNTRhYTkzNjQyYjQ4MzM1N2ExMjkxMWM5NmE5NDM4NmUifQ.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.SzMJjI2UELkn765a2BZausodQN5i93XgwhyZbykUZewhEqHWO56nwowLbgslqThPBDI9qSv9iBLftCeBxFR3Bqd9XNDwfZZppGqBU_UNPi0DxNra-eXAQYJZgUU1mwgvQRfuLcsgvNAQoEh7ML2ng3ix2MiYvtf_VribkQKe1WgARTm_Brxx-iqR6f-VJwt4gi5SckYPHyLxtf8p5kBl_PY1S1sLQgFYKNtxyKVrP2Ykoddk0_bdZdRpnr7MN8RdhjtlUezx4dnQVmaE8FvV5z8tsIAPxTzameY9jP8PQ2Vr1ijPU3it4R6gYKSRQkaliIxj-vprY0IKBPEI99vJZQ&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/Aqf7HEZkM8

Permanent link: aaaa.bot/r/Aqf7HEZkM8 · How we measure

Checked 2026-11-10 02:26:26 UTC. Full DNS report: dns.pizza/domain/mustpay.dev · Age, certificate and blocklists: how.is/mustpay.dev · JSON: /api/v1/mustpay.dev