Yes — cwb.fyi has IPv6.

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

This is a saved measurement from 2026-11-01 22:09 UTC. Check cwb.fyi live now

IPv6 readiness

Website, mail and DNS all work over IPv6.

Website over IPv6 cwb.fyi has 2 IPv6 addresses and answers on every one we tested. ✓ 2606:4700:3032::6815:1c1d answers · 443✓ 2606:4700:3036::ac43:aa36 answers · 443	yes
www over IPv6 www.cwb.fyi has 2 IPv6 addresses and answers on every one we tested. ✓ 2606:4700:3032::6815:1c1d answers · 443✓ 2606:4700:3036::ac43:aa36 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. piers.ns.cloudflare.com ✓bailey.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://cwb.fyi/ via 2606:4700:3032::6815:1c1d → 302https://cwb.fyi/login via 2606:4700:3032::6815:1c1d → 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/cwb.fyi.svg)](https://aaaa.bot/cwb.fyi)

Check again

cwb.fyi Has IPv6

A (IPv4)	104.21.28.29 172.67.170.54
AAAA (IPv6)	2606:4700:3032::6815:1c1d 2606:4700:3036::ac43:aa36

www.cwb.fyi Has IPv6

A (IPv4)	104.21.28.29 172.67.170.54
AAAA (IPv6)	2606:4700:3032::6815:1c1d 2606:4700:3036::ac43:aa36

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: cwb.fyi
Measured 2026-11-01 22:09:08 UTC by aaaa.bot (one server on Fly.io, region iad)

A (IPv4):    104.21.28.29, 172.67.170.54
AAAA (IPv6): 2606:4700:3032::6815:1c1d, 2606:4700:3036::ac43:aa36
www AAAA:    2606:4700:3032::6815:1c1d, 2606:4700:3036::ac43:aa36

Readiness grade A: Website, mail and DNS all work over IPv6.
- Website over IPv6: cwb.fyi has 2 IPv6 addresses and answers on every one we tested.
    2606:4700:3032::6815:1c1d: answers (TCP 443)
    2606:4700:3036::ac43:aa36: answers (TCP 443)
- www over IPv6: www.cwb.fyi has 2 IPv6 addresses and answers on every one we tested.
    2606:4700:3032::6815:1c1d: answers (TCP 443)
    2606:4700:3036::ac43:aa36: 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://cwb.fyi/ via 2606:4700:3032::6815:1c1d -> HTTP 302, certificate: valid
    https://cwb.fyi/login via 2606:4700:3032::6815:1c1d -> HTTP 200, certificate: valid
DNS answers via DNS-over-HTTPS (Cloudflare). Method: https://aaaa.bot/method
Permanent link: https://aaaa.bot/r/kuRYkKtZqN

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

Checked 2026-11-01 22:09:08 UTC. Full DNS report: dns.pizza/domain/cwb.fyi · JSON: /api/v1/cwb.fyi