Yes — inboxbase.app has IPv6.

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

IPv6 readiness

Website, mail and DNS all work over IPv6.

Website over IPv6 inboxbase.app has 2 IPv6 addresses and answers on every one we tested. ✓ 2606:4700:3037::ac43:98f3 answers · 443✓ 2606:4700:3034::6815:40a5 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. liz.ns.cloudflare.com ✓rommy.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://inboxbase.app/ via 2606:4700:3037::ac43:98f3 → 302https://fieldstack.cloudflareaccess.com/cdn-cgi/access/login/inboxbase.app?kid=946f2d656d195748041f1930b716ce20b9ce7f43701b6fa57c84e35098f7b7eb&meta=eyJ0eXAiOiJKV1QiLCJhbGciOiJSUzI1NiIsImtpZCI6IjgwMWRkMDM4N2Y3MDE0N2IzNDZkMWQwNDE0ZjE3MmMyMWU3MTkzOTcwOTY2NmY5YzQyZTE1ZjdiZGVkZTQxYjgifQ.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.ZnZuUNYHAS2odeERAbqujc1iPUwuCCvSZIRzfwR7EGGO_IwxmDcLzOif7kgsZKAboBSzpq9W41lBdlS4G1b7OPpzCYtWdTvEOz0F6MeWGYJtUzj6RH8bA7_fhg0Y8kdb2AM_qjw6ek86_7bxGXNjPnO_O3ymzxqd52LZWTnKNz9lgHDAMcFgO8DukYi7evZpdZ2teueM-ilOT0CRlooT4jcDwu-VhYMgENd2c0l65TWuDVo9yI2UbbTk_zUDzvihQj9aBT_M4oDyWhnJ6I0h1dzCplNSXp186arN7XHXWbvmVNRDzBxX7LuMFewyC5KpU8CwDkWrCvSs_Ry6O8CDEg&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/inboxbase.app.svg)](https://aaaa.bot/inboxbase.app)

Check again

inboxbase.app Has IPv6

A (IPv4)	172.67.152.243 104.21.64.165
AAAA (IPv6)	2606:4700:3037::ac43:98f3 2606:4700:3034::6815:40a5

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: inboxbase.app
Measured 2026-11-07 19:31:41 UTC by aaaa.bot (one server on Fly.io, region iad)

A (IPv4):    172.67.152.243, 104.21.64.165
AAAA (IPv6): 2606:4700:3037::ac43:98f3, 2606:4700:3034::6815:40a5

Readiness grade A: Website, mail and DNS all work over IPv6.
- Website over IPv6: inboxbase.app has 2 IPv6 addresses and answers on every one we tested.
    2606:4700:3037::ac43:98f3: answers (TCP 443)
    2606:4700:3034::6815:40a5: 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://inboxbase.app/ via 2606:4700:3037::ac43:98f3 -> HTTP 302, certificate: valid
    https://fieldstack.cloudflareaccess.com/cdn-cgi/access/login/inboxbase.app?kid=946f2d656d195748041f1930b716ce20b9ce7f43701b6fa57c84e35098f7b7eb&meta=eyJ0eXAiOiJKV1QiLCJhbGciOiJSUzI1NiIsImtpZCI6IjgwMWRkMDM4N2Y3MDE0N2IzNDZkMWQwNDE0ZjE3MmMyMWU3MTkzOTcwOTY2NmY5YzQyZTE1ZjdiZGVkZTQxYjgifQ.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.ZnZuUNYHAS2odeERAbqujc1iPUwuCCvSZIRzfwR7EGGO_IwxmDcLzOif7kgsZKAboBSzpq9W41lBdlS4G1b7OPpzCYtWdTvEOz0F6MeWGYJtUzj6RH8bA7_fhg0Y8kdb2AM_qjw6ek86_7bxGXNjPnO_O3ymzxqd52LZWTnKNz9lgHDAMcFgO8DukYi7evZpdZ2teueM-ilOT0CRlooT4jcDwu-VhYMgENd2c0l65TWuDVo9yI2UbbTk_zUDzvihQj9aBT_M4oDyWhnJ6I0h1dzCplNSXp186arN7XHXWbvmVNRDzBxX7LuMFewyC5KpU8CwDkWrCvSs_Ry6O8CDEg&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/Z3RNMjQYEK

Permanent link: aaaa.bot/r/Z3RNMjQYEK · How we measure

Checked 2026-11-07 19:31:41 UTC. Full DNS report: dns.pizza/domain/inboxbase.app · Age, certificate and blocklists: how.is/inboxbase.app · JSON: /api/v1/inboxbase.app