Yes — solidsystems.courses has IPv6.

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

This is a saved measurement from 2026-11-13 22:03 UTC. Check solidsystems.courses live now

IPv6 readiness

Website, mail and DNS all work over IPv6.

Website over IPv6 solidsystems.courses has 2 IPv6 addresses and answers on every one we tested. ✓ 2606:4700:3033::6815:1c5a answers · 443✓ 2606:4700:3036::ac43:9133 answers · 443	yes
www over IPv6 www.solidsystems.courses has 2 IPv6 addresses and answers on every one we tested. ✓ 2606:4700:3036::ac43:9133 answers · 443✓ 2606:4700:3033::6815:1c5a answers · 443	yes
Mail servers (MX) have IPv6 Every mail server has an AAAA record. solidsystems-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. dolly.ns.cloudflare.com ✓josh.ns.cloudflare.com ✓	yes

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

https://solidsystems.courses/ via 2606:4700:3033::6815:1c5a → 301https://argorant.com/ · redirects to argorant.com, which has no IPv6 address

problem

Nothing keeping you from an A

A redirect leads off IPv6
Redirects to argorant.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

solidsystems.courses Has IPv6

A (IPv4)	104.21.28.90 172.67.145.51
AAAA (IPv6)	2606:4700:3033::6815:1c5a 2606:4700:3036::ac43:9133

www.solidsystems.courses Has IPv6

A (IPv4)	172.67.145.51 104.21.28.90
AAAA (IPv6)	2606:4700:3036::ac43:9133 2606:4700:3033::6815:1c5a

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: solidsystems.courses
Measured 2026-11-13 22:03:24 UTC by aaaa.bot (one server on Fly.io, region iad)

A (IPv4):    104.21.28.90, 172.67.145.51
AAAA (IPv6): 2606:4700:3033::6815:1c5a, 2606:4700:3036::ac43:9133
www AAAA:    2606:4700:3036::ac43:9133, 2606:4700:3033::6815:1c5a

Readiness grade A: Website, mail and DNS all work over IPv6.
- Website over IPv6: solidsystems.courses has 2 IPv6 addresses and answers on every one we tested.
    2606:4700:3033::6815:1c5a: answers (TCP 443)
    2606:4700:3036::ac43:9133: answers (TCP 443)
- www over IPv6: www.solidsystems.courses has 2 IPv6 addresses and answers on every one we tested.
    2606:4700:3036::ac43:9133: answers (TCP 443)
    2606:4700:3033::6815:1c5a: 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 argorant.com, which has no IPv6 address — so IPv6 visitors end up needing IPv4 after all.
    https://solidsystems.courses/ via 2606:4700:3033::6815:1c5a -> HTTP 301, certificate: valid
    https://argorant.com/ (redirects to argorant.com, which has no IPv6 address)
DNS answers via DNS-over-HTTPS (Cloudflare). Method: https://aaaa.bot/method
Permanent link: https://aaaa.bot/r/-ClGyL8RCx

Permanent link: aaaa.bot/r/-ClGyL8RCx · How we measure

Checked 2026-11-13 22:03:24 UTC. Full DNS report: dns.pizza/domain/solidsystems.courses · Age, certificate and blocklists: how.is/solidsystems.courses · JSON: /api/v1/solidsystems.courses