Yes — krox.app has IPv6.

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

IPv6 readiness

Website, mail and DNS all work over IPv6.

Website over IPv6 krox.app has 2 IPv6 addresses and answers on every one we tested. ✓ 2606:4700:3031::ac43:c775 answers · 443✓ 2606:4700:3031::6815:4cc1 answers · 443	yes
www over IPv6 www.krox.app has 2 IPv6 addresses and answers on every one we tested. ✓ 2606:4700:3031::ac43:c775 answers · 443✓ 2606:4700:3031::6815:4cc1 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. santino.ns.cloudflare.com ✓vera.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://krox.app/ via 2606:4700:3031::ac43:c775 → 302https://odd-art-879a.cloudflareaccess.com/cdn-cgi/access/login/krox.app?kid=968bbf70e65fc61599127da40404ebec96481b7c3bd755ab6ab11aa65c68ba0b&meta=eyJ0eXAiOiJKV1QiLCJhbGciOiJSUzI1NiIsImtpZCI6IjNhNTcxZTY1YWU0NmNjZGRlZWFiYjBmNjFlNzU1ZGU0NWFjNWVkYjJhNTdkYzAxZTkwN2FkYmEzNDIxNTMwYzUifQ.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.i9StJ2-o-nYddvt_Yq5d_qM7IZqBRcYU2JMfnAMj1maNOZzZI8JVthdEGksGhDRvAc1LzQs1L8HS9hzy3d45MoPXR-hGtq0j-x6C3bNeaKfK6dI8vuWSkOhScDKWGsE5SC081GA9X8q94CI67GaO4Uij4duVKSemcE3E1_IrVCOSC6hhH_kxKeL0kiGI7GUb8akMHiy87D8oUSyu_YSUBO5d51-FBfeUx3qrWOZjsUwWngcmm-VzGOzGZvXp9bSjsD6v0l7mcqfPJPfD6yyZV-QQclyBUDlPRtoNsyVI-KLLA6Y3pnQ0Zsbj3WojNyqME9GZ1Y91vkdyABnMglpCbA&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/krox.app.svg)](https://aaaa.bot/krox.app)

Check again

krox.app Has IPv6

A (IPv4)	172.67.199.117 104.21.76.193
AAAA (IPv6)	2606:4700:3031::ac43:c775 2606:4700:3031::6815:4cc1

www.krox.app Has IPv6

A (IPv4)	172.67.199.117 104.21.76.193
AAAA (IPv6)	2606:4700:3031::ac43:c775 2606:4700:3031::6815:4cc1

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: krox.app
Measured 2026-11-06 17:00:01 UTC by aaaa.bot (one server on Fly.io, region iad)

A (IPv4):    172.67.199.117, 104.21.76.193
AAAA (IPv6): 2606:4700:3031::ac43:c775, 2606:4700:3031::6815:4cc1
www AAAA:    2606:4700:3031::ac43:c775, 2606:4700:3031::6815:4cc1

Readiness grade A: Website, mail and DNS all work over IPv6.
- Website over IPv6: krox.app has 2 IPv6 addresses and answers on every one we tested.
    2606:4700:3031::ac43:c775: answers (TCP 443)
    2606:4700:3031::6815:4cc1: answers (TCP 443)
- www over IPv6: www.krox.app has 2 IPv6 addresses and answers on every one we tested.
    2606:4700:3031::ac43:c775: answers (TCP 443)
    2606:4700:3031::6815:4cc1: 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://krox.app/ via 2606:4700:3031::ac43:c775 -> HTTP 302, certificate: valid
    https://odd-art-879a.cloudflareaccess.com/cdn-cgi/access/login/krox.app?kid=968bbf70e65fc61599127da40404ebec96481b7c3bd755ab6ab11aa65c68ba0b&meta=eyJ0eXAiOiJKV1QiLCJhbGciOiJSUzI1NiIsImtpZCI6IjNhNTcxZTY1YWU0NmNjZGRlZWFiYjBmNjFlNzU1ZGU0NWFjNWVkYjJhNTdkYzAxZTkwN2FkYmEzNDIxNTMwYzUifQ.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.i9StJ2-o-nYddvt_Yq5d_qM7IZqBRcYU2JMfnAMj1maNOZzZI8JVthdEGksGhDRvAc1LzQs1L8HS9hzy3d45MoPXR-hGtq0j-x6C3bNeaKfK6dI8vuWSkOhScDKWGsE5SC081GA9X8q94CI67GaO4Uij4duVKSemcE3E1_IrVCOSC6hhH_kxKeL0kiGI7GUb8akMHiy87D8oUSyu_YSUBO5d51-FBfeUx3qrWOZjsUwWngcmm-VzGOzGZvXp9bSjsD6v0l7mcqfPJPfD6yyZV-QQclyBUDlPRtoNsyVI-KLLA6Y3pnQ0Zsbj3WojNyqME9GZ1Y91vkdyABnMglpCbA&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/cK-adUWY94

Permanent link: aaaa.bot/r/cK-adUWY94 · How we measure

Checked 2026-11-06 17:00:01 UTC. Full DNS report: dns.pizza/domain/krox.app · Age, certificate and blocklists: how.is/krox.app · JSON: /api/v1/krox.app