Yes — castagent.app has IPv6.

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

A
IPv6 readiness
Website, mail and DNS all work over IPv6.
Website over IPv6
castagent.app has an AAAA record and answers on it.
✓ 2a09:8280:1::1f5:1d70:0 answers · 443
yes
www over IPv6
www.castagent.app has an AAAA record and answers on it.
✓ 2a09:8280:1::1f5:1d70:0 answers · 443
yes
Mail servers (MX) have IPv6
Every mail server has an AAAA record.
mx1.improvmx.com ✓mx2.improvmx.com ✓
yes
Nameservers have IPv6
2 of 2 nameservers checked have an AAAA record, so IPv6-only resolvers can look the domain up.
ns70.domaincontrol.com ✓ns69.domaincontrol.com ✓
yes
HTTPS over IPv6 · not part of the grade yet
Loads over IPv6 with a valid certificate: HTTP 200.
https://castagent.app/ via 2a09:8280:1::1f5:1d70:0 → 200
works
 Which outside scripts, fonts, payments or chat castagent.app loads from have no IPv6.
 Load castagent.app 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/castagent.app.svg)](https://aaaa.bot/castagent.app)

Check again

castagent.app  Has IPv6

A (IPv4)66.241.125.220
AAAA (IPv6)2a09:8280:1::1f5:1d70:0

www.castagent.app  Has IPv6

Alias ofcastagent.app
A (IPv4)66.241.125.220
AAAA (IPv6)2a09:8280:1::1f5:1d70:0

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/WTAClHMUOQ · How we measure

Checked 2026-11-14 11:53:23 UTC. Full DNS report: dns.pizza/domain/castagent.app · Age, certificate and blocklists: how.is/castagent.app · JSON: /api/v1/castagent.app