Yes — fairclients.courses has IPv6.

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

IPv6 readiness

Website, mail and DNS all work over IPv6.

Website over IPv6 fairclients.courses has 2 IPv6 addresses and answers on every one we tested. ✓ 2606:4700:3037::ac43:b342 answers · 443✓ 2606:4700:3036::6815:4ba9 answers · 443	yes
www over IPv6 www.fairclients.courses has 2 IPv6 addresses and answers on every one we tested. ✓ 2606:4700:3036::6815:4ba9 answers · 443✓ 2606:4700:3037::ac43:b342 answers · 443	yes
Mail servers (MX) have IPv6 Every mail server has an AAAA record. fairclients-courses.mail.protection.outlook.com ✓	yes
Nameservers have IPv6 2 of 2 nameservers checked have an AAAA record, so IPv6-only resolvers can look the domain up. venus.ns.cloudflare.com ✓yevgen.ns.cloudflare.com ✓	yes

HTTPS over IPv6 · not part of the grade yet
Redirects to citypicked.com, which has no IPv6 address — so IPv6 visitors end up needing IPv4 after all.

https://fairclients.courses/ via 2606:4700:3037::ac43:b342 → 301https://citypicked.com/ · redirects to citypicked.com, which has no IPv6 address

problem

Nothing keeping you from an A

A redirect leads off IPv6
Redirects to citypicked.com, which has no IPv6 address — so IPv6 visitors end up needing IPv4 after all. Give the redirect target IPv6 too, or redirect somewhere that has it.

Check again

fairclients.courses Has IPv6

A (IPv4)	104.21.75.169 172.67.179.66
AAAA (IPv6)	2606:4700:3037::ac43:b342 2606:4700:3036::6815:4ba9

www.fairclients.courses Has IPv6

A (IPv4)	172.67.179.66 104.21.75.169
AAAA (IPv6)	2606:4700:3036::6815:4ba9 2606:4700:3037::ac43:b342

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: fairclients.courses
Measured 2026-11-14 13:08:15 UTC by aaaa.bot (one server on Fly.io, region iad)

A (IPv4):    104.21.75.169, 172.67.179.66
AAAA (IPv6): 2606:4700:3037::ac43:b342, 2606:4700:3036::6815:4ba9
www AAAA:    2606:4700:3036::6815:4ba9, 2606:4700:3037::ac43:b342

Readiness grade A: Website, mail and DNS all work over IPv6.
- Website over IPv6: fairclients.courses has 2 IPv6 addresses and answers on every one we tested.
    2606:4700:3037::ac43:b342: answers (TCP 443)
    2606:4700:3036::6815:4ba9: answers (TCP 443)
- www over IPv6: www.fairclients.courses has 2 IPv6 addresses and answers on every one we tested.
    2606:4700:3036::6815:4ba9: answers (TCP 443)
    2606:4700:3037::ac43:b342: answers (TCP 443)
- Mail servers (MX) have IPv6: Every mail server 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): Redirects to citypicked.com, which has no IPv6 address — so IPv6 visitors end up needing IPv4 after all.
    https://fairclients.courses/ via 2606:4700:3037::ac43:b342 -> HTTP 301, certificate: valid
    https://citypicked.com/ (redirects to citypicked.com, which has no IPv6 address)
DNS answers via DNS-over-HTTPS (Cloudflare). Method: https://aaaa.bot/method
Permanent link: https://aaaa.bot/r/E-NPD0FKCh

Permanent link: aaaa.bot/r/E-NPD0FKCh · How we measure

Checked 2026-11-14 13:08:15 UTC. Full DNS report: dns.pizza/domain/fairclients.courses · Age, certificate and blocklists: how.is/fairclients.courses · JSON: /api/v1/fairclients.courses