Yes — testtunnel.win has IPv6.

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

IPv6 readiness

Website, mail and DNS all work over IPv6.

Website over IPv6 testtunnel.win has 2 IPv6 addresses and answers on every one we tested. ✓ 2606:4700:3036::6815:5e90 answers · 443✓ 2606:4700:3031::ac43:88dc 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. norm.ns.cloudflare.com ✓susan.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://testtunnel.win/ via 2606:4700:3036::6815:5e90 → 302https://testtunnel-access-domain.cloudflareaccess.com/cdn-cgi/access/login/testtunnel.win?kid=ac3575993d481707b972d5dd47573d5cb29848ae7067bce3988c859462fdc83c&meta=eyJ0eXAiOiJKV1QiLCJhbGciOiJSUzI1NiIsImtpZCI6ImVjOGFhZTg2ODg0Yzg1NTRlZjY2YmVkZGNlZTlhZjdkY2M1ZTM1NDNhZjdmODhhMTYwYTAyMmRlNDVhNDhlNGQifQ.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.IjU8klLspS3heOfBmREyCx9eLQIiByiL5yd5FOL5dJjvDX7fVPWOVW3HcEbmu769Ct_gNzHLCi_vndRt2CafBRAqA7Fe8h49plUMaxpyoOtEMay0sCkopi1-X0XfaYz5Qym2JCrMTHLfslZO3eb3bQEI4NIktV8rxqMiQ2MeQhAewmCiMroeYWCZQA6GnvRn1jloOMHr4vVKnbKNBLpBkoQvT9RSIBpKMUsiUGqdPiW_HC7tntssNcn03ZsbQzb3yD29l1srEtx_sia3vwTNZPeWyF8NIF47piYVv0z6vEyKMgMy9Y9IlNvn-Hcow4DYGIuvrkJjNGlfGJP5VnB8XA&redirect_url=%2F via 2606:4700:300a::6813:c21d → 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/testtunnel.win.svg)](https://aaaa.bot/testtunnel.win)

Check again

testtunnel.win Has IPv6

A (IPv4)	104.21.94.144 172.67.136.220
AAAA (IPv6)	2606:4700:3036::6815:5e90 2606:4700:3031::ac43:88dc

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: testtunnel.win
Measured 2026-11-01 22:44:47 UTC by aaaa.bot (one server on Fly.io, region iad)

A (IPv4):    104.21.94.144, 172.67.136.220
AAAA (IPv6): 2606:4700:3036::6815:5e90, 2606:4700:3031::ac43:88dc

Readiness grade A: Website, mail and DNS all work over IPv6.
- Website over IPv6: testtunnel.win has 2 IPv6 addresses and answers on every one we tested.
    2606:4700:3036::6815:5e90: answers (TCP 443)
    2606:4700:3031::ac43:88dc: 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://testtunnel.win/ via 2606:4700:3036::6815:5e90 -> HTTP 302, certificate: valid
    https://testtunnel-access-domain.cloudflareaccess.com/cdn-cgi/access/login/testtunnel.win?kid=ac3575993d481707b972d5dd47573d5cb29848ae7067bce3988c859462fdc83c&meta=eyJ0eXAiOiJKV1QiLCJhbGciOiJSUzI1NiIsImtpZCI6ImVjOGFhZTg2ODg0Yzg1NTRlZjY2YmVkZGNlZTlhZjdkY2M1ZTM1NDNhZjdmODhhMTYwYTAyMmRlNDVhNDhlNGQifQ.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.IjU8klLspS3heOfBmREyCx9eLQIiByiL5yd5FOL5dJjvDX7fVPWOVW3HcEbmu769Ct_gNzHLCi_vndRt2CafBRAqA7Fe8h49plUMaxpyoOtEMay0sCkopi1-X0XfaYz5Qym2JCrMTHLfslZO3eb3bQEI4NIktV8rxqMiQ2MeQhAewmCiMroeYWCZQA6GnvRn1jloOMHr4vVKnbKNBLpBkoQvT9RSIBpKMUsiUGqdPiW_HC7tntssNcn03ZsbQzb3yD29l1srEtx_sia3vwTNZPeWyF8NIF47piYVv0z6vEyKMgMy9Y9IlNvn-Hcow4DYGIuvrkJjNGlfGJP5VnB8XA&redirect_url=%2F via 2606:4700:300a::6813:c21d -> HTTP 200, certificate: valid
DNS answers via DNS-over-HTTPS (Cloudflare). Method: https://aaaa.bot/method
Permanent link: https://aaaa.bot/r/k8GaxZ_33n

Permanent link: aaaa.bot/r/k8GaxZ_33n · How we measure

Checked 2026-11-01 22:44:47 UTC. Full DNS report: dns.pizza/domain/testtunnel.win · JSON: /api/v1/testtunnel.win