Yes — zerofoxn.app has IPv6.

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

IPv6 readiness

Website, mail and DNS all work over IPv6.

Website over IPv6 zerofoxn.app has 2 IPv6 addresses and answers on every one we tested. ✓ 2606:4700:3037::6815:51f4 answers · 443✓ 2606:4700:3033::ac43:c021 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. mary.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 1 redirect: HTTP 200.

https://zerofoxn.app/ via 2606:4700:3037::6815:51f4 → 302https://zf-brware-test.cloudflareaccess.com/cdn-cgi/access/login/zerofoxn.app?kid=8a18adeeb8bac7440189e31341666a281c4257f4a6f8c87bea5968fc69b3272f&meta=eyJ0eXAiOiJKV1QiLCJhbGciOiJSUzI1NiIsImtpZCI6IjM4ZDFmNTJkYzg5MDEwYjhmNDc1NGQ2MmViNmJkNDBiNDUzZTEyZTIyOTRlNzhkNTJiMzU2MjA1ZTUxNjU5ZmIifQ.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.Y6M2OmQQTB3PODFGwPnEzdxECbXBUGTmyB6s-W43UmKvMu-M0ZHjcnugypAHENu7788SIu-vjAr7o2Qb3q96Ftjzqbr4UHAXAHQe68gt9ryc7FKsDU-IEPTyU6k2ebd_mk6sVx9hGkFTxGOAS2IekUHgByXUAOJUZOzwxCWYsXjwOc5VAFoKYYz-hAVklSWBYI1ukLG7x_B-jlfcJuZ0PZc50vkm9smrifMKPKmTQIq8kwHu8mXCP0tPXrOtIVyXSpQm8-F6mtj12mtcVOm33MBi10E1QIB48pZ_CJ49xv8r-SiiRXtYc6fPr4PcQdIEb3LfKcjgoB7YgJUPF9idhQ&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/zerofoxn.app.svg)](https://aaaa.bot/zerofoxn.app)

Check again

zerofoxn.app Has IPv6

A (IPv4)	104.21.81.244 172.67.192.33
AAAA (IPv6)	2606:4700:3037::6815:51f4 2606:4700:3033::ac43:c021

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: zerofoxn.app
Measured 2026-11-07 18:10:06 UTC by aaaa.bot (one server on Fly.io, region iad)

A (IPv4):    104.21.81.244, 172.67.192.33
AAAA (IPv6): 2606:4700:3037::6815:51f4, 2606:4700:3033::ac43:c021

Readiness grade A: Website, mail and DNS all work over IPv6.
- Website over IPv6: zerofoxn.app has 2 IPv6 addresses and answers on every one we tested.
    2606:4700:3037::6815:51f4: answers (TCP 443)
    2606:4700:3033::ac43:c021: 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://zerofoxn.app/ via 2606:4700:3037::6815:51f4 -> HTTP 302, certificate: valid
    https://zf-brware-test.cloudflareaccess.com/cdn-cgi/access/login/zerofoxn.app?kid=8a18adeeb8bac7440189e31341666a281c4257f4a6f8c87bea5968fc69b3272f&meta=eyJ0eXAiOiJKV1QiLCJhbGciOiJSUzI1NiIsImtpZCI6IjM4ZDFmNTJkYzg5MDEwYjhmNDc1NGQ2MmViNmJkNDBiNDUzZTEyZTIyOTRlNzhkNTJiMzU2MjA1ZTUxNjU5ZmIifQ.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.Y6M2OmQQTB3PODFGwPnEzdxECbXBUGTmyB6s-W43UmKvMu-M0ZHjcnugypAHENu7788SIu-vjAr7o2Qb3q96Ftjzqbr4UHAXAHQe68gt9ryc7FKsDU-IEPTyU6k2ebd_mk6sVx9hGkFTxGOAS2IekUHgByXUAOJUZOzwxCWYsXjwOc5VAFoKYYz-hAVklSWBYI1ukLG7x_B-jlfcJuZ0PZc50vkm9smrifMKPKmTQIq8kwHu8mXCP0tPXrOtIVyXSpQm8-F6mtj12mtcVOm33MBi10E1QIB48pZ_CJ49xv8r-SiiRXtYc6fPr4PcQdIEb3LfKcjgoB7YgJUPF9idhQ&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/cMaGb8Ei9C

Permanent link: aaaa.bot/r/cMaGb8Ei9C · How we measure

Checked 2026-11-07 18:10:06 UTC. Full DNS report: dns.pizza/domain/zerofoxn.app · Age, certificate and blocklists: how.is/zerofoxn.app · JSON: /api/v1/zerofoxn.app