Yes — replyhook.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
replyhook.app has 2 IPv6 addresses and answers on every one we tested.
✓ 2606:4700:3033::ac43:9306 answers · 443✓ 2606:4700:3031::6815:57dc 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.
norman.ns.cloudflare.com ✓stella.ns.cloudflare.com ✓
yes
HTTPS over IPv6 · not part of the grade yet
Loads over IPv6 with a valid certificate: HTTP 200.
https://replyhook.app/ via 2606:4700:3033::ac43:9306 → 200
works
 Load replyhook.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/replyhook.app.svg)](https://aaaa.bot/replyhook.app)

Check again

replyhook.app  Has IPv6

A (IPv4)104.21.87.220
172.67.147.6
AAAA (IPv6)2606:4700:3033::ac43:9306
2606:4700:3031::6815:57dc

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/gv-v2JTg5d · How we measure

Checked 2026-11-01 15:43:58 UTC. Full DNS report: dns.pizza/domain/replyhook.app · JSON: /api/v1/replyhook.app