Yes — herald.zone 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 herald.zone has an AAAA record and answers on it. ✓ 2a09:8280:1::1c2:e006:0 answers · 443	yes
www over IPv6 www.herald.zone has an AAAA record and answers on it. ✓ 2a09:8280:1::1c2:e006:0 answers · 443	yes
Mail servers (MX) have IPv6 None of the mail servers has an AAAA record. eforward1.registrar-servers.com ✗eforward2.registrar-servers.com ✗eforward3.registrar-servers.com ✗eforward4.registrar-servers.com ✗eforward5.registrar-servers.com ✗	no
Nameservers have IPv6 2 of 2 nameservers checked have an AAAA record, so IPv6-only resolvers can look the domain up. dns1.registrar-servers.com ✓dns2.registrar-servers.com ✓	yes

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

https://herald.zone/ via 2a09:8280:1::1c2:e006:0 → 200

works

What's keeping herald.zone from an A

Mail servers without IPv6
eforward1.registrar-servers.com, eforward2.registrar-servers.com, eforward3.registrar-servers.com, eforward4.registrar-servers.com, eforward5.registrar-servers.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

herald.zone Has IPv6

A (IPv4)	66.241.124.223
AAAA (IPv6)	2a09:8280:1::1c2:e006:0

www.herald.zone Has IPv6

Alias of	herald-zone.fly.dev
A (IPv4)	66.241.124.223
AAAA (IPv6)	2a09:8280:1::1c2:e006:0

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: herald.zone
Measured 2026-11-06 12:13:26 UTC by aaaa.bot (one server on Fly.io, region iad)

A (IPv4):    66.241.124.223
AAAA (IPv6): 2a09:8280:1::1c2:e006:0
www AAAA:    2a09:8280:1::1c2:e006:0

Readiness grade B: Works over IPv6, with one gap: its mail servers lack IPv6.
- Website over IPv6: herald.zone has an AAAA record and answers on it.
    2a09:8280:1::1c2:e006:0: answers (TCP 443)
- www over IPv6: www.herald.zone has an AAAA record and answers on it.
    2a09:8280:1::1c2:e006:0: answers (TCP 443)
- Mail servers (MX) have IPv6: None of the mail servers 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: HTTP 200.
    https://herald.zone/ via 2a09:8280:1::1c2:e006:0 -> HTTP 200, certificate: valid
DNS answers via DNS-over-HTTPS (Cloudflare). Method: https://aaaa.bot/method
Permanent link: https://aaaa.bot/r/V9uiJqcibR

Permanent link: aaaa.bot/r/V9uiJqcibR · How we measure

Checked 2026-11-06 12:13:26 UTC. Full DNS report: dns.pizza/domain/herald.zone · Age, certificate and blocklists: how.is/herald.zone · JSON: /api/v1/herald.zone