Yes — tacstackdigital.biz has IPv6.

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

IPv6 readiness

Website, mail and DNS all work over IPv6.

Website over IPv6 tacstackdigital.biz has 2 IPv6 addresses and answers on every one we tested. ✓ 2606:4700:3031::ac43:ab5a answers · 443✓ 2606:4700:3035::6815:27c9 answers · 443	yes
www over IPv6 www.tacstackdigital.biz has 2 IPv6 addresses and answers on every one we tested. ✓ 2606:4700:3035::6815:27c9 answers · 443✓ 2606:4700:3031::ac43:ab5a answers · 443	yes
Mail servers (MX) have IPv6 Every mail server has an AAAA record. smtp.google.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 ✓john.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://tacstackdigital.biz/ via 2606:4700:3031::ac43:ab5a → 301https://tacstack.net/ via 2606:4700:20::681a:a8e → 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/tacstackdigital.biz.svg)](https://aaaa.bot/tacstackdigital.biz)

Check again

tacstackdigital.biz Has IPv6

A (IPv4)	172.67.171.90 104.21.39.201
AAAA (IPv6)	2606:4700:3031::ac43:ab5a 2606:4700:3035::6815:27c9

www.tacstackdigital.biz Has IPv6

A (IPv4)	172.67.171.90 104.21.39.201
AAAA (IPv6)	2606:4700:3035::6815:27c9 2606:4700:3031::ac43:ab5a

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: tacstackdigital.biz
Measured 2026-11-13 22:35:30 UTC by aaaa.bot (one server on Fly.io, region iad)

A (IPv4):    172.67.171.90, 104.21.39.201
AAAA (IPv6): 2606:4700:3031::ac43:ab5a, 2606:4700:3035::6815:27c9
www AAAA:    2606:4700:3035::6815:27c9, 2606:4700:3031::ac43:ab5a

Readiness grade A: Website, mail and DNS all work over IPv6.
- Website over IPv6: tacstackdigital.biz has 2 IPv6 addresses and answers on every one we tested.
    2606:4700:3031::ac43:ab5a: answers (TCP 443)
    2606:4700:3035::6815:27c9: answers (TCP 443)
- www over IPv6: www.tacstackdigital.biz has 2 IPv6 addresses and answers on every one we tested.
    2606:4700:3035::6815:27c9: answers (TCP 443)
    2606:4700:3031::ac43:ab5a: 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): Loads over IPv6 with a valid certificate after 1 redirect: HTTP 200.
    https://tacstackdigital.biz/ via 2606:4700:3031::ac43:ab5a -> HTTP 301, certificate: valid
    https://tacstack.net/ via 2606:4700:20::681a:a8e -> HTTP 200, certificate: valid
DNS answers via DNS-over-HTTPS (Cloudflare). Method: https://aaaa.bot/method
Permanent link: https://aaaa.bot/r/NgRJ1AUZhv

Permanent link: aaaa.bot/r/NgRJ1AUZhv · How we measure

Checked 2026-11-13 22:35:30 UTC. Full DNS report: dns.pizza/domain/tacstackdigital.biz · Age, certificate and blocklists: how.is/tacstackdigital.biz · JSON: /api/v1/tacstackdigital.biz