Yes — puzzlebind.com has IPv6.

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

IPv6 readiness

Works over IPv6, with one gap: its mail servers lack IPv6.

Website over IPv6 puzzlebind.com has 2 IPv6 addresses and answers on every one we tested. ✓ 2606:4700:310c::ac42:2cc0 answers · 443✓ 2606:4700:310c::ac42:2f40 answers · 443	yes
www over IPv6 www.puzzlebind.com has 2 IPv6 addresses and answers on every one we tested. ✓ 2606:4700:310c::ac42:2cc0 answers · 443✓ 2606:4700:310c::ac42:2f40 answers · 443	yes
Mail servers (MX) have IPv6 None of the mail servers has an AAAA record. fwd1.porkbun.com ✗fwd2.porkbun.com ✗	no
Nameservers have IPv6 4 of 4 nameservers checked have an AAAA record, so IPv6-only resolvers can look the domain up. curitiba.ns.porkbun.com ✓fortaleza.ns.porkbun.com ✓maceio.ns.porkbun.com ✓salvador.ns.porkbun.com ✓	yes

HTTPS over IPv6 · not part of the grade yet
Loads over IPv6 with a valid certificate: HTTP 200.

https://puzzlebind.com/ via 2606:4700:310c::ac42:2cc0 → 200

works

What's keeping puzzlebind.com from an A

Mail servers without IPv6
fwd1.porkbun.com, fwd2.porkbun.com have no AAAA record, so mail from IPv6-only servers can't reach them directly. If a provider runs your mail, that's their setting; if you run it, add AAAA records for these hosts.

Check again

puzzlebind.com Has IPv6

A (IPv4)	172.66.47.64 172.66.44.192
AAAA (IPv6)	2606:4700:310c::ac42:2cc0 2606:4700:310c::ac42:2f40

www.puzzlebind.com Has IPv6

Alias of	puzzlebind.pages.dev
A (IPv4)	172.66.44.192 172.66.47.64
AAAA (IPv6)	2606:4700:310c::ac42:2cc0 2606:4700:310c::ac42:2f40

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: puzzlebind.com
Measured 2026-11-10 05:34:58 UTC by aaaa.bot (one server on Fly.io, region iad)

A (IPv4):    172.66.47.64, 172.66.44.192
AAAA (IPv6): 2606:4700:310c::ac42:2cc0, 2606:4700:310c::ac42:2f40
www AAAA:    2606:4700:310c::ac42:2cc0, 2606:4700:310c::ac42:2f40

Readiness grade B: Works over IPv6, with one gap: its mail servers lack IPv6.
- Website over IPv6: puzzlebind.com has 2 IPv6 addresses and answers on every one we tested.
    2606:4700:310c::ac42:2cc0: answers (TCP 443)
    2606:4700:310c::ac42:2f40: answers (TCP 443)
- www over IPv6: www.puzzlebind.com has 2 IPv6 addresses and answers on every one we tested.
    2606:4700:310c::ac42:2cc0: answers (TCP 443)
    2606:4700:310c::ac42:2f40: answers (TCP 443)
- Mail servers (MX) have IPv6: None of the mail servers has an AAAA record.
- Nameservers have IPv6: 4 of 4 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: HTTP 200.
    https://puzzlebind.com/ via 2606:4700:310c::ac42:2cc0 -> HTTP 200, certificate: valid
DNS answers via DNS-over-HTTPS (Cloudflare). Method: https://aaaa.bot/method
Permanent link: https://aaaa.bot/r/ULeGN_F0WK

Permanent link: aaaa.bot/r/ULeGN_F0WK · How we measure

Checked 2026-11-10 05:34:58 UTC. Full DNS report: dns.pizza/domain/puzzlebind.com · Age, certificate and blocklists: how.is/puzzlebind.com · JSON: /api/v1/puzzlebind.com