Yes — castapp.tech has IPv6.

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

A
IPv6 readiness
Website, mail and DNS all work over IPv6.
Website over IPv6
castapp.tech has 2 IPv6 addresses and answers on every one we tested.
✓ 2606:4700:3031::6815:b06 answers · 443✓ 2606:4700:3035::ac43:934d 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.
kenneth.ns.cloudflare.com ✓marlowe.ns.cloudflare.com ✓
yes
HTTPS over IPv6 · not part of the grade yet
Loads over IPv6 with a valid certificate: HTTP 200.
https://castapp.tech/ via 2606:4700:3031::6815:b06 → 200
works
 Load castapp.tech over IPv6 from up to six other places — a second opinion.

Nothing keeping you from an A

  1. Nothing to fix
    Show it off: add the badge to your README.
    [![IPv6](https://aaaa.bot/badge/castapp.tech.svg)](https://aaaa.bot/castapp.tech)

Check again

castapp.tech  Has IPv6

A (IPv4)104.21.11.6
172.67.147.77
AAAA (IPv6)2606:4700:3031::6815:b06
2606:4700:3035::ac43:934d

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

 Permanent link: aaaa.bot/r/l18TxlHaHv · How we measure

Checked 2026-11-02 07:19:40 UTC. Full DNS report: dns.pizza/domain/castapp.tech · JSON: /api/v1/castapp.tech