Yes — anthropic-finance.com has IPv6.

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

B
IPv6 readiness
Works over IPv6, with one gap: its mail servers lack IPv6.
Website over IPv6
anthropic-finance.com has an AAAA record and answers on it.
✓ 2a0d:7c40:3000:1415::2 answers · 443
yes
Mail servers (MX) have IPv6
None of the mail servers has an AAAA record.
mail.anthropic-finance.com ✗
no
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 ✓ken.ns.cloudflare.com ✓
yes
HTTPS over IPv6 · not part of the grade yet
The certificate served over IPv6 at 2a0d:7c40:3000:1415::2 isn't valid for anthropic-finance.com: ERR_TLS_CERT_ALTNAME_INVALID.
https://anthropic-finance.com/ via 2a0d:7c40:3000:1415::2 · ERR_TLS_CERT_ALTNAME_INVALID
problem
 Which outside scripts, fonts, payments or chat anthropic-finance.com loads from have no IPv6.
 Load anthropic-finance.com over IPv6 from up to six other places — a second opinion.

What's keeping anthropic-finance.com from an A

  1. The certificate served over IPv6 is wrong
    The certificate served over IPv6 at 2a0d:7c40:3000:1415::2 isn't valid for anthropic-finance.com: ERR_TLS_CERT_ALTNAME_INVALID. Often the IPv6 address points at a different server (or an old one) than IPv4 does. Make sure 2a0d:7c40:3000:1415::2 serves the same certificate as your IPv4 address.
  2. Mail servers without IPv6
    mail.anthropic-finance.com has no AAAA record, so mail from IPv6-only servers can't reach it directly. If a provider runs your mail, that's their setting; if you run it, add AAAA records for these hosts.

Check again

anthropic-finance.com  Has IPv6

A (IPv4)192.236.237.160
AAAA (IPv6)2a0d:7c40:3000:1415::2

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

 Permanent link: aaaa.bot/r/xT6WW-2P0d · How we measure

Checked 2026-11-12 07:46:25 UTC. Full DNS report: dns.pizza/domain/anthropic-finance.com · Age, certificate and blocklists: how.is/anthropic-finance.com · JSON: /api/v1/anthropic-finance.com